Report

Step Files:

File Type File Name Thumbnail Submitted By Date Created Description Action
jpg Snowball earth
Snowball earth
Alexis Hood 10/03/2012
jpg neanderthals
neanderthals
Shannon Singh 10/05/2012
jpg hurricane katrina
hurricane katrina
Shannon Singh 10/05/2012 earth view
jpg hurricane katrina
hurricane katrina
Shannon Singh 10/05/2012 city view
jpg Columbus
Columbus
Shannon Singh 10/05/2012
jpg homo sapien timeliine
homo sapien timeliine
Shannon Singh 10/05/2012
jpg Alexis's Family
Alexis's Family
Alexis Hood 10/06/2012
jpg dawn of technology
dawn of technology
Alexis Hood 10/06/2012
jpg Austalopithecus(lucy) walk the earth
Austalopithecus(lucy) walk the earth
Alexis Hood 10/06/2012
jpg pliestocene ice age
pliestocene ice age
Alexis Hood 10/06/2012
jpg homoerectus exist
homoerectus exist
Alexis Hood 10/06/2012
jpg adaptive radiation of mammals
adaptive radiation of mammals
Alexis Hood 10/06/2012
jpg asteoid struck earth
asteoid struck earth
Alexis Hood 10/06/2012
jpg becoming bipedal
becoming bipedal
Alexis Hood 10/06/2012
jpg beginning of the cenezoic era
beginning of the cenezoic era
Alexis Hood 10/06/2012
jpg hawaiian islands created
hawaiian islands created
Alexis Hood 10/06/2012
jpg st. Andreas Fault created
st. Andreas Fault created
Alexis Hood 10/06/2012
jpg primitive monkeys evolved
primitive monkeys evolved
Alexis Hood 10/06/2012
jpg ending of the mesazoic era
ending of the mesazoic era
Alexis Hood 10/06/2012
jpg K-T Boundary of extinction of the dinosaurs
K-T Boundary of extinction of the dinosaurs
Alexis Hood 10/06/2012
jpg reign of mammals
reign of mammals
Alexis Hood 10/06/2012
jpg modern sharks evolve
modern sharks evolve
Alexis Hood 10/06/2012
jpg angiosperm first appear
angiosperm first appear
Alexis Hood 10/06/2012
jpg first birds
first birds
Alexis Hood 10/06/2012
jpg end of triassic era
end of triassic era
Alexis Hood 10/06/2012
jpg appearance of mammals
appearance of mammals
Alexis Hood 10/06/2012
jpg pangea begins to break apart
pangea begins to break apart
Alexis Hood 10/06/2012
jpg close of Palezoic era
close of Palezoic era
Alexis Hood 10/06/2012
jpg permian species mass extinction
permian species mass extinction
Alexis Hood 10/06/2012
jpg rise of reptiles
rise of reptiles
Alexis Hood 10/06/2012
jpg primitive insects evolve
primitive insects evolve
Alexis Hood 10/06/2012
jpg Late Devonian Extinction
Late Devonian Extinction
Alexis Hood 10/06/2012
jpg Amphibians evolve
Amphibians evolve
Alexis Hood 10/06/2012
jpg Late Ordovician Extinction
Late Ordovician Extinction
Alexis Hood 10/06/2012
jpg First land plants
First land plants
Alexis Hood 10/06/2012
jpg rise of fish
rise of fish
Alexis Hood 10/06/2012
jpg oldest metazoin fossil
oldest metazoin fossil
Alexis Hood 10/06/2012
jpg rise of multi-cell organism
rise of multi-cell organism
Alexis Hood 10/06/2012
jpg Eukaryotic cell organism develop
Eukaryotic cell organism develop
Alexis Hood 10/06/2012
jpg first signs of oxygen in the atmosphere
first signs of oxygen in the atmosphere
Alexis Hood 10/06/2012
jpg first ozone layer formed
first ozone layer formed
Alexis Hood 10/06/2012
jpg prokaryotic cell organisms created
prokaryotic cell organisms created
Alexis Hood 10/06/2012
jpg oldest evidence of rocks
oldest evidence of rocks
Alexis Hood 10/06/2012
jpg oldest dated rocks
oldest dated rocks
Alexis Hood 10/06/2012
jpg melting of the earth
melting of the earth
Alexis Hood 10/06/2012
jpg apes web page
apes web page
Shannon Singh 10/07/2012
jpg family pic
family pic
Shannon Singh 10/07/2012
jpg last ice sheet
last ice sheet
Shannon Singh 10/07/2012
jpg atlantic opens
atlantic opens
Shannon Singh 10/07/2012
jpg babyme.jpg
babyme.jpg
Alexis Hood 10/07/2012
jpg earth_interior-250x187.jpg
earth_interior-250x187.jpg
Alexis Hood 10/08/2012
jpg frilledshark.jpg
frilledshark.jpg
Alexis Hood 10/08/2012
jpg Shannon
Shannon
Shannon Singh 11/07/2012
Youtube last ice sheet retreats
last ice sheet retreats
Shannon Singh 10/07/2012
Youtube origin of earth
origin of earth
Shannon Singh 10/07/2012
Youtube pangea
pangea
Shannon Singh 11/05/2012
Youtube lucy
lucy
Shannon Singh 11/05/2012
Youtube san andreas fault
san andreas fault
Shannon Singh 11/05/2012
Youtube katrina
katrina
Shannon Singh 11/05/2012
Youtube oahu formation
oahu formation
Shannon Singh 11/05/2012
Youtube snowball earth
snowball earth
Shannon Singh 11/05/2012
Youtube launch distant view
launch distant view
Shannon Singh 11/07/2012
Youtube launch 1
launch 1
Shannon Singh 11/07/2012


Step: Shannon and Lexi's Timeline_Report

Directions for Step: For the project, you will use the rtf editor as your word processor. You will create copies of your sources by going to 'Share -> Collaboration -> New.' You will create one per source, naming it effectively. For the category of your collaboration, make one titles 'Sources.' For your bibliography hyperlink to your original sources, and reference the copy you made in your appendix. In the appendix, attach your sources.
Directions for Form: Please complete the form. For your bibliograpy remember to also hyper link to your sources and to reference the appendix. For appendix section, store your sources as collaboration objections and attach.

Step 1: Report

What is the title of your report?
Shannon and Alexis's Timeline
Report:

Life History Event Timeline

APES LIFE HISTORY ANALOGY If all of life's history (4.6 billion years) were the time it takes a spacecraft to get into orbit(8.5 minutes), then the following events would happen at




 

 

 

 Event #  Your Analogy Value Years Ago 
1 8.5 minutes .000001 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos.


At the end of their sohpomore year Alexis Hood and Shannon Singh enrolled in Mr.Pitts's AP Environmental Science class.

 Event #  Your Analogy Value Years Ago 
 2 8.499999987 minutes .000007 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 



Hurricane Katrina was one of the strongest storms to impact the coast of the Unites States during the last 100 years.With sustained winds during landfall of 125 mph (110 kts) (a strong category 3 hurricane on the Saffir-Simpson scale) and minimum central pressure the third lowest on record at landfall (920 mb), Katrina caused widespread devastation along the central Gulf Coast states of the US. Cities such as New Orleans, LA, Mobile, AL, and Gulfport, MS bore the brunt of Katrina's force and will need weeks and months of recovery efforts to restore normality.

 Event #  Your Analogy Value Years Ago 
 3 8.49999997minutes

.000016 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 


On October 15th Shannon's  directfamily grew to its current state of six people. Her dad remarried a woman named Kristi who had a son named Michael. They joined my brother Ayden, sister Kali, and father Todd. Shannon's family also has three pets two dogs named Hope and Rocky and one cat named Neo.

 Event #  Your Analogy Value Years Ago 
 4  8.49999997 minutes .000016 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 

Alexis's direct family has four members. Her father named Scott, mother  Lisa, and brother Taylor. They also have three dogs named Ally, Shasta, And Tails.

 Event #  Your Analogy Value Years Ago 
 5  8.49999997 minutes .000016 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 

 Shannon was born October 23rd 1996.
 Event #  Your Analogy Value Years Ago 
6 8.49999997 minutes .000016 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 


Alexis was Born September 24th 1996

 Event #  Your Analogy Value Years Ago 
7 8.499999 minutes .000506 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
Columbus led his three ships - the Nina, the Pinta and the Santa Maria - out of the Spanish port of Palos on August 3, 1492. His objective was to sail west until he reached Asia (the Indies) where the riches of gold, pearls and spice awaited. His first stop was the Canary Islands where the lack of wind left his expedition becalmed until September 6. Once underway, Columbus benefited from calm seas and steady winds that pushed him steadily westward (Columbus had discovered the southern "Trades" that in the future would fuel the sailing ships carrying goods to the New World). However, the trip was long, longer than anticipated by either Columbus or his crew. In order to mollify his crew's apprehensions, Columbus kept two sets of logs: one showing the true distance traveled each day and one showing a lesser distance. The first log was kept secret. The latter log quieted the crew's anxiety by under-reporting the true distance they had traveled from their homeland. This deception had only a temporary effect; by October 10 the crew's apprehension had increased to the point of near mutiny. Columbus headed off disaster by promising his crew that if land was not sighted in two days, they would return home. The next day land was discovered.
 Event #  Your Analogy Value Years Ago 
8 8.49997 minutes .015 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 


             This ice sheet was the primary feature of the Pleistocene epoch in North America, commonly referred to as the ice age. It was up to 2 mi (3.2 km) thick in Nunavik, Quebec, Canada but much thinner at its edges where nunataks were common in hilly areas. It created much of the surface geology of southern Canada and the northern United States, leaving behind glacially scoured valleys, moraines, eskers and glacial till. It also caused many changes to the shape, size, and drainage of the Great Lakes. As but one of many examples, near the end of the last ice age, Lake Iroquois extended well beyond the boundaries of present day Lake Ontario, and drained down the Hudson River into the Atlantic Ocean
 Event #  Your Analogy Value Years Ago 
9 8.49995 minutes .03 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
Neanderthals are classified alternatively as a subspecies of Homo sapiens (Homo sapiens neanderthalensis) or as a separate human species (Homo neanderthalensis). The first proto-Neanderthal traits appeared in Europe as early as 600,000–350,000 years ago.Proto-Neanderthal traits are occasionally grouped with another phenetic 'species', Homo heidelbergensis, or a migrant form, Homo rhodesiensis.
 Event #  Your Analogy Value Years Ago 
10 8.4999 minutes .05 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
        homo sapiens exist
The earliest fossils of Homo sapiens date to about 200,000 years ago. Homo sapiens means “intelligent human,” and modern humans are classified in this species. Homo sapiens is believed to have evolved from Homo erectus. The evolution is thought to have taken place in Africa. The earliest fossils of Homo sapiens show a gradual change over the last 200,000 years into varieties of Homo sapiens, but not new species.
 Event #  Your Analogy Value Years Ago 
11 8.497 minutes 1.6 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
   
Homo erectus is an extinct species of hominid that lived from the end of the Pliocene epoch to the later Pleistocene, with the earliest first fossil evidence dating to around 1.8 million years ago and the most recent to around 300,000 years ago.There is still disagreement on the subject of the classification, ancestry, and progeny of H. erectus, with two major alternative classifications: erectus may be another name for Homo ergaster, and therefore the direct ancestor of later hominids such as Homo heidelbergensis, Homo neanderthalensis, and Homo sapiens. It may also  be an Asian species distinct from African ergaster.
 Event #  Your Analogy Value Years Ago 
12 8.496 minutes 2 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
An ice age, or more precisely, a glacial age, is a period of long-term reduction in the temperature of the Earth's surface and atmosphere, resulting in the presence or expansion of continental ice sheets, polar ice sheets and alpine glaciers. Within a long-term ice age, individual pulses of cold climate are termed "glacial periods" (or alternatively "glacials" or "glaciations" or colloquially as "ice age"), and intermittent warm periods are called "interglacials". Glaciologically, ice age implies the presence of extensive ice sheets in the northern and southern hemispheres.By this definition, we are still in the ice age that began 2.6 million years ago at the start of the Pleistocene epoch, because the Greenland and Antarctic ice sheets still exist
 Event #  Your Analogy Value Years Ago 
13 8.496 minutes 2 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 

            Early human use of stone tool technology, such as the hand axe, was similar to that of primates, which is found to be limited to the intelligence levels of modern children aged 3 to 5 years. The first "homo" species began with homo habilis about 2.4 to 1.5 million years ago. Intelligence and use of technology did not change much for millions of years.
 Event #  Your Analogomo erectus existy Value Years Ago 
14 8.494 minutes 3.4 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 

 Austalopithecus (Lucy) walks the earth    
Australopithecus afarensis fossils were first discovered in Ethiopia, in 1974. One of the best known representatives of this species, also found in Hadar, was Lucy. That was the nickname given to several hundred bone pieces that made up about forty per cent of one individual believed to be female. There was great controversy about whether Lucy and her relatives were strictly bipedal or if they had also been tree-climbers, or a bit of both. But the discovery of this mid-foot bone has likely put those questions to rest.       
 Event #  Your Analogy Value Years Ago 
15 8.493 minutes 4 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 becoming bipedal           
The oldest evidence for walking on two legs comes from one of the earliest humans. walking upright helped species survive in the diverse habitats near where it lived. This species habitat included grasslands and forests.
 Event #  Your Analogy Value  Years Ago 
16 8.483 minutes 9 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 

 St. Andreas fault
Scientists have learned that the Earth's crust is fractured into a series of "plates" that have been moving very slowly over the Earth's surface for millions of years. Two of these moving plates meet in western California; the boundary between them is the San Andreas fault. The Pacific Plate (on the west) moves northwestward relative to the North American Plate (on the east), causing earthquakes along the fault. The San Andreas is the "master" fault of an intricate fault network that cuts through rocks of the California coastal region. The entire San Andreas fault system is more than 800 miles long and extends to depths of at least 10 miles within the Earth. In detail, the fault is a complex zone of crushed and broken rock from a few hundred feet to a mile wide. Many smaller faults branch from and join the San Andreas fault zone. Almost any road cut in the zone shows a myriad of small fractures, fault gouge (pulverized rock), and a few solid pieces of rock.
 Event #  Your Analogy Value Years Ago 
17 8.426 minutes 40 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 

 Hawaiian islands created
The Hawaiian Islands where formed by such a hot spot occurring in the middle of the Pacific Plate. While the hot spot itself is fixed, the plate is moving. So, as the plate moved over the hot spot, the string of islands that make up the Hawaiian Island chain were formed.
 Event #  Your Analogy Value Years Ago 
18 8.408 minutes 50 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
The first primate-like mammals or proto-primates appeared. They were roughly similar to squirrels and tree shrews in size and appearance. Fossil evidence shows they were adapted to a tree-living way of life in warm, moist climates.
 Event #  Your Analogy Value Years Ago 
19 8.381 minutes 65 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
adaptive radiation of mammals   
mammals were mostly confined to roles as generalized, small-bodied, nocturnal insectivores, presumably under selection pressures from dinosaurs. Release from these pressures, by extinction of non-avian dinosaurs at the Cretaceous-Paleogene boundary, triggered ecological diversification of mammals. Although recent individual fossil discoveries have shown that some mammalian lineages diversified ecologically during the Mesozoic era, comprehensive ecological analysis of mammalian groups crossing the Cretaceous-Palaeogene boundary are lacking.
      
 Event #  Your Analogy Value Years Ago 
20 8.381 minutes 65 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 beginning of cenozoic era
The Cenozoic Era spans some 65 million years, beginning 65 million years ago with the
Palaeocene epoch. The Cenozoic Era is divided into the Palaeogene period (which consists of the Palaeocene, Eocene and Oligocene epochs), the Neogene period (which consists of the Miocene and Pliocene epochs) and the Quaternary period (the Pleistocene and Holocene epochs). This era happened after the mesozoic era.
 Event #  Your Analogy Value Years Ago 
21 8.381 minutes 65 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
ending of mesozoic era   
The Mesozoic Era spans 183 million years. It starts off with the Triassic period 248 million years ago. this era then finishes with the end of the Cretaceous period 65 million years ago
        
 Event #  Your Analogy Value Years Ago 
22 8.381 minutes 65 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 asteroid struck earth
 A huge asteroid or comet smashed into the Earth off the coast of Mexico at the end of the Cretaceous Period 65 million years ago and is widely believed to have killed off the dinosaurs. This causes the mass extinction to the dinosaurs. this also caused the start of a new era.
 Event #  Your Analogy Value Years Ago 
23 8.381 minutes 65 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 

 K-T boundary of extinction of the dinosaurs and beginning of the reign of mammals

About 65 million years ago, at the end of the Cretaceous, a large fraction of plant and animal families suddenly went extinct. In this Cretaceous-Tertiary or K-T mass extinction (K is for Kreide, meaning chalk in German, which describes the chalky sediment layer from that time; T is for Tertiary, the next geologic period), all land animals over about 55 pounds went extinct, as did many smaller organisms. The K-T mass extinction obliterated the dinosaurs , pterosaurs, plesiosaurs, mosasaurs, ammonites, some families of birds and marsupial mammals, over half the plankton groups, many families of teleost (bony) fishes, bivalves, snails, sponges, sea urchins and others. This catastrophe eventually led to the Age of Mammals.

 Event #  Your Analogy Value Years Ago 
24 8.334 minutes 90 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 Modern Sharks
Divergent evolution began to further separate the Chondrichthyans from the primitive fish, creating an array of beings that would come to be known as the possible progenitors of all shark species. These animals are considered to have been highly advanced for their time, possessing a great deal of the same characteristics seen in modern shark species. Now nearly 400,000 millennia of evolution have generated over 1,100 highly advance species of sharks and rays that swim the oceans in place of their ancient ancestors

 Event #  Your Analogy Value Years Ago 
25 8.259 minutes 130 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 Angiosperms (flowering plants) first appear
Recent studies of angiosperm evolution, using data fromdeoxyribonucleic acid (DNA) sequences, have led to the proposal that an obscure shrub from the South Pacific island of New Caledonia, called Amborella trichopoda, represents what is left of the ancestral sister group (a related organism that branched off before the evolution of another group of organisms) to all the angiosperms.As a sister group to all the angiosperms, it is considered to be the most primitive (in an evolutionary sense) of the angiosperms and therefore should resemble what the ancestor to the angiosperms was like. It does possess some of the expected primitive traits for a primitive angiosperm, such as small, greenish-yellow flowers and a lack of vessels for conducting water from the ground to the leaves
 Event #  Your Analogy Value Years Ago 
26 8.232 minutes 145 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
Atlantic ocean first opens

Progressive opening of the Atlantic Ocean between the Americas and at first Africa, laterIberia and finally Europe caused large differential motions between these continents. This happened during the Mesozoic era.

 Event #  Your Analogy Value Years Ago 
27 8.204 minutes 160 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
first birds
The first birds evolved in the Mesozoic Era. The earliest proto-bird we know of in the fossil record is archaeopteryx, which lived in the late Jurassic Era some 150 million years ago. They have evolved in the Cretaceous period.
 Event #  Your Analogy Value Years Ago 
28 8.130 minutes 200 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 

 end of triassic period
The end of the period was marked by yet another major mass extinction, wiping out many groups and allowing dinosaurs to assume dominance in the Jurassic. This era was part of the Mesozoic Era which ended 183 million years ago. The triassic era was the "Reptile" era.
 Event #  Your Analogy Value Years Ago 
29 8.130 minutes 200 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 Appearance of mammals

Mammals are vertebrates. They have a backbone which encloses a sheath of nerves which leads in turn to a brain in a box or skull. They also have four limbs and special pentadactyl ends to these limbs (i.e. 5 fingers and toes). Reptiles, amphibians and even birds, as well as the awe inspiring dinosaurs, are built around this same simple plan. Before this there were fish which had the backbone and the skull, but not the pentadactyl limbs. these are the first known mammals.

 Event #  Your Analogy Value Years Ago 
30 8.130 minutes 200 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 

 Pangaea (the super continent) broke apart when all the tectonic plates that were beneath Pangaea moved and caused several large earthquakes to occur. This, in turn, broke up Pangaea.  Pangea begins to break apart
Pangaea broke apart during the
Triassic and Jurassic periods of the Mesozoic, separating into Laurasia and Gondwana.
 Event #  Your Analogy Value Years Ago 
31 8.047 minutes 245 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
Close of paleozoic era 
The Palaeozoic Era spans 322 million years, beginning with the Cambrian period 570 million years ago, and finishing with the end of the Permian period 248 million years ago. The Permian period begins 286 million years ago and spans 38 million years. It is the closing period of the Palaeozoic era.The Carboniferous period begins 354 million years ago and spans 68 million years. It is the longest period of the Palaeozoic era. 

    
 Event #  Your Analogy Value Years Ago 
32 8.038 minutes 250 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
Permian species mass extinction 

At the end of the Permian period, 248 million years ago, many groups of animals including the Goniatites and Trilobites become extinct. they became extinct thanks to background extinction. Nothing caused them to become a mass extinction.

 Event #  Your Analogy Value Years Ago 
33 7.946 minutes 300-200 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
rise of reptiles
The reptiles become the dominant land fauna, such as Dimetrodon which is a common carnivorous reptile. It reached a length of 3.5 meters (11 feet). The first mammal-like reptiles appeared during the Permian Era. They arose after the arrival of Permian species.
 Event #  Your Analogy Value Years Ago 
34 7.853 minutes 350 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 Primitive insects evolve
            Some of the earliest arthropods (or, for that matter, animals) to walk on land and breathe air were the scorpions, centipedes, and millipedes. These found themselves on land as much as 400 million years ago. The oldest insect fossils date back to the Carboniferous and exhibit wings and other advanced features which suggest tens of millions of years of evolution before the Carboniferous.
 Event #  Your Analogy Value Years Ago 
35 7.816 minutes 370 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 Late Devonian (extinction)
The Devonian period begins 412 million years ago and spans 58 million years.A major intra-Devonian extinction occurred at the Frasnian-Famennian boundary. The crisis primarily affected the marine community, having little impact on the terrestrial flora.
 Event #  Your Analogy Value Years Ago 
36 7.807 minutes 375 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
Primitive Sharks Evolve
 There were sharks in the oceans of earth long before the first   animals had begun to colonies the land surface. Their history stretches back for at least 400 million years, a vast period of time which makes the 2-million-year-old history of human ( genus Homo) seem insignificant by comparison.  
                   
 Event #  Your Analogy Value Years Ago 
37 7.807 minutes 375 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
Amphibians evolve
It's only in the late Carboniferous period, from about 310 to 300 million years ago, that we can comfortably refer to the first true amphibians. By this time, some genera had attained relatively monstrous sizes. the amphibians of the Carboniferous and Permian periods can be divided into two camps: small and weird-looking (the lepospondyls), and big and reptile-like (the temnospondyls). The lepospondyls were mostly aquatic or semi-aquatic, and more likely to have the slimy skin characteristic of modern amphibians.
 Event #  Your Analogy Value Years Ago 
38 7.678 minutes 445 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
Late Ordovician (extinction) The Ordovician extinction occurred at the end of the Ordovician period, about 440-450 million years ago. This extinction, cited as the second most devastating extinction to marine communities in earth history, caused the disappearance of one third of all brachiopod and bryozoan families, as well as numerous groups of conodonts, trilobites, and graptolites. Much of the reef-building fauna was also decimated. In total, more than one hundred families of marine invertebrates perished in this extinction.

 Event #  Your Analogy Value Years Ago 
39 7.654 minutes 458 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
first land plants
Algae cast up on the sea shore or trapped in evaporating ponds were subjected to drying winds and often to large temperature swings. At first they probably just died, but over millions of years a few algae were able to resist short periods of dryness and live on. These became the ancestors of our land plants.
 Event #  Your Analogy Value Years Ago 
40 7.576 minutes 500-450 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
rise of fish
The legacy of fish stretches all the way back to the beginning of the Paleozoic period. The first of the armored fish appeared during the Ordovician. From the Ordovician through the Devonian, fish ruled the world. Bone is another characteristic which enhanced the structure of the fish. Fish started out as cartilaginous and later developed a bone skeleton. Throughout the evolution of fish we can see many key aspects take place such as the jaw and vertebrate structures.
 Event #  Your Analogy Value Years Ago 
41 6.837 minutes 900 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
oldest metazoin fossils
The oldest Medazoen Fossils were plants. Plants were the first known fossil to be found on earth. plants have been surviving in out world since the beginning of time.

          
 Event #  Your Analogy Value Years Ago 
42 5.728 minutes 1,500-600,000 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 
rise of multi-cell organisms
Multi-Cell eukaryotes arose. They arose after the evolution of prokaryotic and ekaryotic cells. they are more complex than the other two cells.
 Event #  Your Analogy Value Years Ago 
43 5.728 minutes 1,500,000 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 eukaryotic cell organisms develop
1.5 billion years ago eukaryotic cells arose. these cells arose after the prokaryotic cells. they were created 2 billion years after the prokaryotic cell.
 Event #  Your Analogy Value Years Ago 
44 4.804 minutes 2,000,000 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 first signs of oxygen in atmosphere and first ozone layer formed
After loss of the hydrogen, helium and other hydrogen-containing gases from early Earth due to the Sun's radiation, primitive Earth was devoid of an atmosphere. The first atmosphere was formed by outgassing of gases trapped in the interior of the early Earth, which still goes on today in volcanoes. This then created the first ozone layer.
 Event #  Your Analogy Value Years Ago 
45 2.033 minutes 3,500,000 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 
 prokaryotic cell organisms created
3.5 billion years ago the first life arose: prokaryotic cells. These cells are considered to be "primitive". These cells evolved before eukaryotic cells did.
 Event #  Your Analogy Value Years Ago 
46 1.478 minutes 3,800,000 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 

Earths Crust Solidifies
The Earth's rocky outer crust solidified billions of years ago, soon after the Earth formed. This crust is not a solid shell; it is broken up into huge, thick plates that drift atop the soft, underlying mantle.
 Event #  Your Analogy Value Years Ago 
47 1.293 minutes 3,900,000 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 

 Oldest dated rocks
Some of the oldest surface rock can be found in the Canadian Shield, Australia, Africa and in other more specific places around the world. The ages of these felsic rocks are generally between 2.5 and 3.8 billion years. The approximate ages have a margin of error of millions of years. In 1999, the oldest known rock on Earth was dated to 4.031 ± 0.003 billion years, and is part of the Acasta Gneiss of the Slave craton in northwestern Canada. Researchers at McGill University found a rock with a very old model age for extraction from the mantle (3.8 to 4.28 billion years ago) in the Nuvvuagittuq greenstone belt on the coast of Hudson Bay, in northern Quebec; the true age of these samples is still under debate, and they may actually be closer to 3.8 billion years old. Older than these rocks are crystals of the mineral zircon, which can survive the disaggregation of their parent rock and be found and dated in younger rock formations.
 Event #  Your Analogy Value Years Ago 
48 .554  minutes 4,300,000 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 

            Melting of the earth 
Under extreme CO2 radiative forcing (greenhouse effect), built up over millions of years because CO2 consumption by silicate weathering is slowed by the cold, while volcanic and metamorphic CO2 emissions continue unabated. Snowball earth melted due to the CO2 in the air. Also it melted due to the eruption of volcanoes.

 Event #  Your Analogy Value Years Ago 
49 .185 minutes 4,500,000 million years ago
Description of Events that Affected Life on Earth. Also Include Picture or Videos. 

 
Snowball earth
Planet Earth covered by ice from pole to pole for long periods in the geological pastSnowball earth describes the coldest global climate imaginable - a planet covered by glacial ice from pole to pole. The global mean temperature would be about -50°C (-74°F) because most of the Sun's (Solar) radiation would be reflected back to space by the icy surface.
 Event #  Your Analogy Value Years Ago 
50 0 minutes 4,600,000 million years ago
   
           

Origin of Earth 
The history of Earth began 4.6 billion years ago, when a gigantic cloud of gas and dust began to concentrate due to the effect of gravity.With the help of gravity and heat, the sun and planets were formed. Beginning as a burning liquid rock, the Earth eventually formed into the planet we know today.


Bibliography:
Appendix: