A Time Line. Alfred Wegener (1910-1920) Proposed Theory of Continental Drift – based on puzzle-like fit of continents Discovered three key pieces of evidence.

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Presentation transcript:

A Time Line

Alfred Wegener ( ) Proposed Theory of Continental Drift – based on puzzle-like fit of continents Discovered three key pieces of evidence Fossil clues (glossopteris and mesosaurus) Glacial clues (striations in no-glacial areas) Rock clues (Appalachian Mtn and Greenland/Europe) Died without substantial proof of HOW continents could move

Arthur Homes (1930s) Explained Continental Drift Power of magma convection in the mantle Sea-floor spreading mountain building Still had no hard data for proof, but answered the question of HOW the continents COULD move

Harry Hess (1960s) Proved seafloor spreading Sonar – mapped the ocean floor Molten material Drilling samples Geomagnetism Technology finally caught up with the great minds of the scientists

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