Andes Mountains, South America. Evidence of Continental Drift. Fossils Similar fossils of several different animals and plants that once lived on land had been found on widely separated continents. The ages of different fossils predated Wegener’s time frame for the breakup of Pangaea.
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How are the earth’s layers similar to an egg?
5-100 km thick
2 types of crust
Oceanic (very dense, made of basalt)
Continental (less dense, made of granite)
Very thick layer
Roughly 2800 km thick
No one has ever drilled to the mantle
It is VERY hot
composed of silicate rocks that are rich in iron and magnesium
Even though its solid it can flow
Convection Currents Cause the Tectonic Plates to move
Movement of these plates Cause: