Shared Flashcard Set

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ameck
plate tectonics
20
Science
7th Grade
02/19/2014

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Cards

Term
Continental Drift
Definition
continents drifted to current location (from Pangaea)
Term
continetal drift proposed by
Definition
it was proposed by Wegener
Term
2 problems with theory
Definition
1.no proof 2.no explanation how it happened
Term
his proof
Definition
Fossil Clues, Climate Clues, Rock Clues
Term
Fossil Clues
Definition
similar plant and animal fossils found on both sides of the Atlantic Ocean
Term
Climate Clues
Definition
a) glacial evidence in warmer climates
b) fossils of ferms in cold climates
Term
Rock Clues
Definition
similar rock types found on both sides of the Atlantic Ocean
Term
Seafloor Spreading
Definition
molten rock pushed through at mid atlantic ridge
Term
who was it proposed by
Definition
proposed by Hess
Term
his proof
Definition
1) Newer rocks near mid- Atlantic ridge
2) Magnetic clues in rocks
Term
Plate Tectonics
Definition
crustal sections (plates) move around on mantle
Term
Plate boundaries
Definition
where plates meet
Term
Convergent
Definition
plates come together
Term
continental collision
Definition
2 continental plates collide
Term
Subduction
Definition
denser oceanic plate goes under less dense continental plate
Term
Divergent
Definition
plates spread apart
Term
Transform
Definition
plates slide by each other
Term
Rift Valley
Definition
two continental plates move apart
Term
Seafloor spreading
Definition
2 oceanic plates move apart
Term
what do plates move by
Definition
plates move by convection currents
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