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The Earth Has Changed Over Geological Time

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The earth changed over geologic time because because of evolution. Animals have evolved over the years. Take the whale for example. The whale started out as a land animal. Pakicetus was the land animal that the whale started out as. Pakicetus was alive 50 million years ago. It evolved over the years (and you can  see that in the picture next to it.)

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This is a Dorudon, the Dorudon is an evolved form of the Pakicetus. Dorudon existed 40.4 - 33.9 million years ago.

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This is a image demonstrating the evolution of the pakicetus!

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This is a wide span of the ice floors of antartica

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In the Artic glacial erosion has formed much of the Landscape. Glaciers essentially erode through plucking and abrasion. “Plucking occurs as a glacier flows over bedrock, softening and lifting blocks of rock that are brought into the ice. The intense pressure at the base of the glacier causes some of the ice to melt, forming a thin layer of subglacial water. This water flows into cracks in the bedrock. As the water refreezes, the ice acts as a lever loosening the rock by lifting it. The fractured rock is thus incorporated into the glacier’s load and is carried along as the glacier slowly moves”-Beyond Penguins, And Polar Bears.

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Most of the Earth's continents have been periodically joined together into supercontinents as the movement of the plates brought them together. The most recent of these supercontinents, Pangaea, formed about 270 million years ago and broke up about 200 million years ago. This represents how earth has changed over geological time because earth is mage up rock and that is what changed, it changed because all of the continents were once all together, and now they are all separate!

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This is a  “time lapse” of how Pangea eventually separated over the lap of millions of years

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Above-freezing temperatures created a meltwater stream on the Scott Glacier, Antarctica. Photo courtesy of BlueCanoe (Flickr). In this image you can see a man by a hug every chunk of rock that was moved Tom him due to the melt water stream

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Most of the dry land on Earth was stuck together as one huge land form that covered nearly a third of the planet's surface. The ocean that is around the continent is called Panthalassa. The movement of Earth's tectonic plates formed pangea and then, causing it to ultimately break apart creating the 7 continents.