10 - 1 Continental Drift.

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10 - 1 Continental Drift

Continental Drift Alfred Wegner – German scientist 1912 – proposed idea of Pangaea Super Continent All Lands Continents “fit” like a puzzle

Continental Drift Pangaea broke apart and moved into present positions Still moving Continental Drift – movement of continents Most thought he was wrong

Fossil and Climate Clues Similar fossils found on separate continents Glossopteris (plant) – Africa, S.A., Australia, Antarctica Mesosaurus (reptile) – Africa and S.A.

Fossil and Climate Clues Africa and S.A. – glacier evidence Antarctica – once had a tropical climate Fossil evidence

Rock Clues Similar rocks on different continents Scotland and Newfoundland – Same rock structure Similar mountain ranges across oceans Joined 250 million years ago

Why? Wegner couldn’t figure out what made the continents move. Many scientist didn’t take him seriously. Years later technology gave an answer to why.

Mid-Ocean Ridge Underwater mountain chain Valley in center Sediment thinner by ridge Rocks older farther away

Harry Hess US Naval Officer in WWII “Sea floor spreading” New sea floor at ridge

Seafloor Spreading Magma oozes out onto ocean floor Plates move away from each other Sea Floor Spreading - New crust forms

Seafloor Spreading North American Plate is moving away from European and African Plate

Paleomagnetism Magnetic minerals on ocean floor Mirrored alternating magnetic stripes on either side of ridge

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