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Plate tectonics

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by

Allie Emerton

on 10 May 2010

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Transcript of Plate tectonics

Plate Tectonics Boundaries Convergent Divergent when the plates hit each other, but since plates
move very slowly it takes up to millions of years
of the pushing into each other to hit. The plates
slip, and break. Pangea 3 environments; Extensional Compressional Continental drift Convection currents Cenozoic - Mesozoic - Paleozoic - Precambrian - Founded by; Alfred Wegener Transform "new life". It covers sixty-five point five million years ago all the way until now. “middle life”. It extends from two hundred and fifty-one million years ago to when the Cenozoic era began sixty-five million years ago “ancient life”. This one extends from about two hundred and fifty-one million years ago to five hundred and forty-two years ago years. "from about 3,800 million years ago until 544 million years ago." It extends from forty-five hundred million years ago. Transform plates move away from each other plates move in toward each other plates move up/down past each other,
they make friction whilst passing each other As the two plates pull apart, normal faults develop on both sides of the rift and the central blocks slide downwards. Earthquakes occur as a result of this fracturing and movement. the location where two plates slide past one another. could cause an upwelling beneath the crust, forcing it to break apart and move Earths internal structure; Time Line; The names are in greek Crust - Oceanic crust and continental crust. They’re both made up of different types of rock. “The thin oceanic crust is composed of primarily of basalt,” and “ the thicker continental crust is composed primarily of granite.” The oceanic crust is much thinner than the continental crust. The oceanic crust ‘underlies’ the ocean basin. The continental one ‘underlies’ the continents Mantle - Mainly made up of granite. The temperate gets hotter the closer to the center you get. In the upper part of the mantle the rocks there are cool and brittle, they break under stress and make earthquakes. Rocks in the lower part of the mantle are hot and soft, they flow when they’re subjected to forces instead of just breaking.
Core - Is divided into two zones. The core is mostly made up of an iron and nickel mixture. (Well… It’s assumed to be that way since the meteorites have that in them.) The core of the earth is the main source of the internal heat only because it contains radioactive materials that release heat and break into more stable substances. The outer side of the core is liquid, and the inner is solid. Other people had noticed it, but he was the first to come up and say anything about it.
He had seen how the continents fit together perfectly like puzzle pieces.
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