Theory of Continental Drift

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Presentation transcript:

Theory of Continental Drift Alfred Wegener 1915

Evidence for continental drift matching coastlines (jigsaw puzzle)

matching folded mountain ranges

glacier features

fossils (Lystrosaurus)

Evidence for continental drift matching coastlines matching folded mountains glacier features fossils

Pangaea A Greek word meaning “All-lands” Split apart approximately 200 million years ago

Continental drift What moved the continents ? No one believed it was possible

Glomar Challenger 1960’s this ship took core samples of ocean floor rocks as it crossed the Atlantic Ocean A map was produced from this data showing the rock types and ages This map shows what moved the continents

Ocean floor rock ages Youngest rocks in the middle 200 million year old rocks near the shore Sea-floor Spreading pushes the continents apart

Does sea floor spreading explain everything ? If the Atlantic Ocean is spreading apart somewhere it is coming together.

Unexpected consequence of continental drift

Earthquake and Volcano Distribution Weekly quakes map

Plate Tectonics Wegener’s evidence Glomar Challenger’s data earthquake volcano map Theory of Plate Tectonics