The Layers of the Earth

The Layers of the Earth
This picture shows all the layers of the earth, from the inner core to the crust.

Plate Tectonics

Plate Tectonics
This is a picture of plate tectonics fitting together just like a jig-saw puzzle

Tuesday, April 7, 2009

Plate Tectonics

The Theory of Plate Tectonics is a theory of the coninental plates drifting apart, colliding together, and grinding past each other little by little separtating the continents which once was a super continent called Pangea. The plates colliding creates volcanoes or mountain ranges. The plates sometimes even create earthquakes. When the earth's plates move apart, magma comes up and cooling down quickly forming earth's new crust. The convection currents are driving the plates together and apart from each other.
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The Pangea

Pangea was one super continent that was on the earth 200,000,000 years ago. The word Pangea means 'all land' in Greek. The pieces that made up this super continent split up and drifted slowly apart, and became the seven continents today.

Scientists say that they knew there was Pangea because there were the same matching fossils that were found in Africa and South America. Also, all the continents would fit almost perfectly together like a jig-saw puzzle.

Plate Tectonics

Plate Tectonics
This is a picture of all the different plates on Earth