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Earth's Early Evolution

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by

Kaylee Clark

on 14 January 2013

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Transcript of Earth's Early Evolution

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli Earth's Early Evolution 1.5 Ga: Earths crust breaks into vast plates because of Earth's hot liquid core. The plates continue moving(plate tectonics). The super continent Rodinia is formed.

750 Ma: Rodinia splits in two. Volcanoes pump (a greenhouse gas) into the atmosphere. The Earth warms. Rain washes the atmosphere, trapping carbon dioxiden into Earths rocks. The Earth cools into a ball of ice (Ice age). Then it warms again. 360 Ma: Amphibians make land their home. Now there are Insects but they are much bigger then they are now.

250 Ma: Permian extinction happened. The Volcanic ash in the air killed the animals and the plants around the world the temp gets hotter and water evaporates almost all living things died.

200 Ma: Pangaea super continent is formed (plate tectonics). The rain cleans the atmosphere. Photosynthesis creates oxygen(O2). The temperature stabilizes.

180 Ma: First mammals. Dinosaurs dominate. Pangaea breaks up and forms the Atlantic ocean.

*Continents move at the same rate your fingernails grow (2.5cm per year). 3.8 Ga: Life giving water covers the surface of Earth. Volcanoes burst out molten rock through the crust. After it cools it forms volcanic islands (Will become continents).

3.5 Ga: Hot liquid comes out of the bottom of the ocean and creates single cell life. In the shallow ocean plants are growing out of the sea bed each is a mountain of living bacteria that turns sun light into food and forms oxygen (photosynthesis). 542 Ma: Cambrian explosion begins. Invertebrates dominate the sea. Gondwana is formed. Because of radiation blasting on Earths surface there is no life on land. Radiation turns oxygen (O2) into Ozone (O3). The Ozone layer protects the Earth from Radiation.

375 Ma : Life from the sea start to move to the land. 65million years ago : An asteroid from space impacts Earth. Minutes after, boulders start raining down. Earthquakes and tsunamis devastate the Earth. Months after there is still no sunlight because of the dust in the atmosphere.
Dinosaurs and many other species die. 47 Ma: Monkeys, our ancestors, evolve. The Himalayan mountains are formed.

1-2 Ma: Humans start to evolve.

70 thousand years ago: Climate changes and the red sea is shallow enough for a small group of humans to cross out of Africa.

40 thousand years ago: another ice age happens.

20 thousand years ago : sea level falls because of all the frozen ice.

14 thousand years ago : Earth starts to get warmer so the ice melts and the temperature stabilizes. 13.7 Ga: The big bang happens.

10 Ga: Our galaxy forms from the debris.

4.5 Ga: A Mars sized asteroid from space impacts Earth creating a ring of debris circling Earth. The ring of debris compresses and becomes our Moon.

3.9 Ga: Earth starts to cool and forms a thin crust of rock above layers of magma. Volcanoes eject gasses that create a new atmosphere (out gassing). Meteors impact Earth with small amounts of salt and water in them. At first Moon was close to earth but after time it move away . http://www.sciencemuseum.org.uk/WhoAmI/FindOutMore/Yourgenes/Wheredidwecomefrom/Whowerethefirsthumans.aspx http://news.nationalgeographic.com/news/2004/07/0714_040714_moonfacts.html http://www.sciencedaily.com/releases/2008/03/080320150025.htm http://www.youtube.com/watch?v=BoGBD4vGCBc http://io9.com/5744636/a-geological-history-of-supercontinents-on-planet-earth http://news.softpedia.com/news/How-the-First-Continents-Formed-259173.shtml http://www.mrdowling.com/612-himalayas.html
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