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Hines
Plate Tectonics
24
Science
7th Grade
02/19/2014

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Cards

Term
continental drift
Definition
continents drifted to current location (from Pangaea)
Term
who proposed the continental drift theory?
Definition
proposed by Wegner in 1912
Term
what were the problems of the con. drift theory?
Definition
he didn't have proof and he didn't have an explanation.
Term
fossil clues of con. drift theory
Definition
similar plant and animal fossils found on both sides of the Atlantic
Term
climate of con. drift theory
Definition
glacial evidence in warmer climates
fossils of ferns in cold climates
Term
climate clues of con. drift theory
Definition
glacial evidence in warmer climates
fossils of ferns in cold climates
Term
rock clues of con. drift theory
Definition
similar rock types found on both sides of the Atlantic Ocean
Term
seafloor spreading
Definition
molten rock pushed thru at mid-Atlantic Ridge
Term
seafloor spreading proposed by henry hess (1960's)
Definition
proof
newer rocks near mid-Atlantic Ridge
magnetic clues in rocks
Term
plate tectonic theory
Definition
crustal sections (plates) move around on mantle
Term
how do plates move?
Definition
plates move by convection current
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)
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. African rift valley)
Term
transform
Definition
plate slide by each other- ex. - San Andreas fault (California)
Term
earthquakes
Definition
vibrations that rocks produce when they break
Term
faults
Definition
surface that rocks move along when they break
Term
normal fault
Definition
caused by rock above the fault moving downward in relation to he rock below the fault
Term
reverse fault
Definition
compression forces squeeze rock above the fault up and over the rock below the fault
Term
strike-slip fault
Definition
rocks on either side of the fault move past each other without much upward or downward motion
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