2Continental DriftTheory 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.
4Continental 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.
5Support for Continental Drift Matching coastlines.
6Support for Continental Drift FossilsMatching fossils across continents.
7Support for Continental Drift Changes in climatesEvidence of glaciers found in tropical areas and fossil ferns found in polar areas.
8Support for Continental Drift Matching rocks across continentsEx. – Same age/composition rock layers in Appalachians as in Greenland and western Europe.