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Evolution of the earth's crust report!

Noemie's Science Page

Evidence of the movement and evolution of the Earth's crust Summary: Earthquakes and Volcanoes activity result in tectonic plates, it is caused by the molten rock in earths mantle below the crust. There are 7 larger tectonic plates and other smaller ones that cover the Earth. They are diverging, converging, or moving opposite ways. They also sometimes hit each other. At places where some converge, it can cause mountains, and volcanoes to form. (1) The type of plates: There are 2 types of tectonic plates, oceanic plates which are very heavy and dense that form the oceans floor. Then there are continental plates that are very thick but lighter. When a continental plate and an oceanic plate collide, the continental plate will go on top while the oceanic plate goes down. In the middle of the Atlantic ocean plates move away from each other. (2)

How they move & Why: Because some continents are above two plates those continents move when the plates do. Scientists use GPS satellites and laser technology to measure the tectonic plates movements. (3)

Where they are & What they are like: The plates are like pieces of a cracked shell that rests on the super hot molten rock of Earths mantle. The heat from radioactive processes on the planets interior causes the plates to move, sometimes toward each other or away from each other. (2) Evidence: The evidence that we have is that a scientist named Alfred Wegener said, 100 years ago that the continents had moved and were still moving, he had the idea when he saw that the coasts of South America and Africa fit together like two pieces in a puzzle. The earths crust moves about 3 to 5 centimeters a year. The evidence we have on why the earths crust is moving is because we can see it in Earthquakes, The Grand Canyon, Mountain Formation, and, Volcanoes activities. (3) More Evidence: Evidence from fossils and glaciers show us how the plates once fit together. Some fossils tell us when and where animals once existed. (4)

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