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ryan evans
plate techtonics
4
Science
7th Grade
02/19/2014

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Term
Continental drift
Definition
continents drift to current location (Pangaea)Proposed by Wegener (1912)Problems with theory 1) no proof 2)no explanation how it happened
Term
Proof of continental drift
Definition
Fossil clues- similar plant and animal fossils found on both sides of the Atlantic ocean
Climate clues- glacial evidence in warmer climates fossils of ferns in cold climates.
Term
rock clues
Definition
similar plant animal fossils at both sides of the Atlantic ocean
Term
seafloor spreading
Definition
molten rock pushed through the mid-Atlantic ridge.
proposed by Hess (1960s)
proof
new rocks near mid-Atlantic ridge
magnetic clues
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