Continental Drift Chapter 10, Section 1.

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Presentation transcript:

Continental Drift Chapter 10, Section 1

Continental Drift Theory that states that all continents slowly move through time. Suggests that all continents were joined in one continent, Pangaea, which began to break apart about 200 million years ago.

Continental Drift Developed by Alfred Wegener in early 1900’s. Controversial idea as Wegner had no reason why the continents should move. Stated that the spin of the Earth caused less dense continental crust to plow through more dense oceanic crust.

Support for Continental Drift Matching coastlines.

Support for Continental Drift Fossils Matching fossils across continents.

Support for Continental Drift Changes in climates Evidence of glaciers found in tropical areas and fossil ferns found in polar areas.

Support for Continental Drift Matching rocks across continents Ex. – Same age/composition rock layers in Appalachians as in Greenland and western Europe.

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