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Jtorpps
continental drift
13
Science
7th Grade
02/19/2014

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Term
Continental drift
Definition
continents drifted to current location (from Pangaea)Proposed by Wegener (1912)
Term
Fossil clues
Definition
similar plant and animal fossils found on both sides of the Atlantic Ocean
Term
Climate clues
Definition
glacial evidence in warmer climates
Fossils of ferns in cold climates
Term
Rock clues
Definition
similar rock types found on both sides of the Atlantic Ocean
Term
Sea floor spreading
Definition
molten rock pushed thru at mid-Atlantic ridge
Term
plate tectonics theory
Definition
crustal sections (plates) move around on mantle
Term
convergent
Definition
plates come together
Term
Continental collision
Definition
two continental (less dense) plates collide (ex. – India & Asia
Term
subduction
Definition
denser oceanic plate goes under less dense continental plate (ex.California coast)
Term
divergent
Definition
plates spread apart
Term
seafloor spreading
Definition
two oceanic plates move apart (ex. – mid- Atlantic ridge
Term
rift valley
Definition
two continental plates move apart (ex. – E. Africa rift valley
Term
Problems with theory
Definition
1) No proof
2) No explanation how it happened
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