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The best explanation of how the universe was created approximately 14 billion years ago, originally developed in the late 1920s by Georges-Henri Lemaître, a Belgian catholic priest and astronomer.
http://www.big-bang-theory.com/
http://www.wisegeek.org/what-is-the-big-bang-theory.htm -
the Earth is estimated to be around 4.6 billion years old.
http://www.discoveryeducation.com/teachers/free-lesson-plans/birth-of-the-earth.cfm -
The Precambrian covers almost 90% of the entire history of the Earth. It is also were jellyfish, worms, moss and other soft bodied creatures that are hard to fossilize are found.
http://www.geo.msu.edu/geogmich/Precambrian.htmlhttp://www.buzzle.com/articles/precambrian-animals.html -
Shelled marine invertebrates appear and the first vertebrates appear There is no evidence of land animals, this is the reason scientist believe that most of the continent was covered in warm shallow seas.
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includes the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian periods
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Modern oxygen and a rich atmosphere had formed, while the trilobite population had decreased. Also, thick boney plated fish were found along with cephalopods and vertebrates in the Ordovician period.
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Modern sea stars and coral are more common, and the first land plant appears. There are also walking animals, warmer climates, and dry land.
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The Devonian period is sometimes called the age of fish, lunged fish and many boney fish appeared along with amphibians, giant hoarse tails, ferns and seed bearing plants.
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There were many amphibians, while the land was covered in forest and swamps with generally warm climates.
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Includes the Pennsylvanian period and Mississippian period
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The first reptiles appeared along with coal and oil deposits, and also giant insects like cockroaches and dragonflies are common.
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In the Permian period Pangaea formed along with mountains caused by tectonic plates moving creating more climates. There was also a mass extinction that only a few reptiles could survive.
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http://videos.howstuffworks.com/animals/triassic-period-videos-playlist.htm#video-28445
in the Triassic period there were dinosaurs, new marine invertebrates, ammonites which were the index fossils, reptiles like ichthyosaurs, cone bearing trees which are trees similar to palm trees, and the first mammals. There was also a warm tropical climate and lush forest. -
includes the Cretaceous, Jurassic, and Triassic periods
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There were lizard hipped dinosaurs, herbivores, flying reptiles, and primitive birds. Pangaea had split into two continents creating more coastlines changing the dry climates into humid.http://en.wikipedia.org/wiki/Jurassic
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There were the earliest flowering plants and modern birds, along with maple trees, magnolias, and willows there were also dinosaurs. And the climate was relatively warm throughout most of the continents while volcanoes reshaped the land in the middle and Far East, along with another mass extinction.
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includes the Quaternary and Tetiary periods
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It was the begging of the age of mammals, and the first primates appeared.There were new mammals, small rodents that evolved as well.
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Early mammals became extinct, while large species of deer, pigs, horses, camels, dogs, and cats appeared, and marine invertebrates like snails continued to flourish. The Himalayas had also formed when the Indian subcontinent collided with the Eurasian continent; the climates also became cooler and drier.
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Bear, dog, and cat families better known as predators appeared, and herbivores like giant ground sloths and the first modern horses appeared. There were also dramatic climate changes. Central America formed while sea levels dropped and ice sheets began to spread.
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Some species evolved and developed fur to survive the cold like the wooly mammoth and wooly rhinos, while other animals survived by moving to warmer regions. Humans appeared while giant ground sloths became extinct. Ice sheets in Eurasia had formed as well.
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http://www.youtube.com/watch?v=pYSC6623K7I
The temperatures dropped to 4 degrees c, and the earliest known ancestors of the horses, the first whales, flying squirrels, and bats as well as small reptiles. -
The largest mammals know appeared in this epoch, there were horses, camels, deer, rhinos, pigs, raccoons, wolves, foxes, and saber tooth cats, it is possible that the earliest human ancestor may have appeared here. Circumpolar currents formed around Antarctica, while sea levels dropped, and the Mediterranean Sea had dried up and refilled several times.
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Modern humans developed agriculture and also made and used tools made of bronze and iron. Ice sheets melted while sea levels rose, coastlines formed to their present shapes and the great lakes formed.
