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

Convergent and Divergent Boundaries

What is a Convergent Boundary? 
Well, a convergent boundary is when two plate would collide. This process would take millions of years, and plates would only move one centimeter a year. A convergent boundary would make volcanoes or mountains.

What is a Divergent Boundary?
Unlike the convergent boundary, divergent boundaries is when two plates move apart. When the lithospheric plate moves apart, and a new layer of the earth's crust moves up. A divergent boundary would form many volcanoes, with a lot of magma. 
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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