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plate tetonics
abrecht
19
Science
7th Grade
02/19/2014

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Cards

Term
continental drift
Definition
continents drifted to current location from pangaea
Term
alfred wegner
Definition
propossed continental drift 1912
Term
problems of continental drift
Definition
1 no proof
2 no explanation for how it happened
Term
fossil clues proof of continental drift
Definition
similar to plant and animal fossils found on both sides of atlantic
Term
climate clues proof of continental drift
Definition
1 glacial evidence in warmer climates
2 ffossils of ferns in cold climates
Term
rock clues proof of continental drift
Definition
similar rock types found on both side of atlantic
Term
Seafloor spreading
Definition
molten rock pushed through mid atlantic ridge
Term
Hess
Definition
propsed seafloor spreading in 1960
Term
proof of seafloor spreading
Definition
1 newer rocks near mid atlantic ridge
2 magnetic clues in rocks
Term
plate tetonic theory
Definition
crustal sections (plates0 move around on mantle
Term
how many major plates are their
Definition
13-14
Term
plate boundaries
Definition
where plates meet
Term
convergent
Definition
plates come together
Term
continental collision
Definition
two continental (less dense) plates collide (ex. india and asia)
form mountains
Term
subduction
Definition
denser oceainic 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 . East african rift valley)
Term
transform
Definition
plates slide by eachother (ex san andreas fault California
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