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Gourgoulianis
Plate Tectonics
20
Science
7th Grade
02/19/2014

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Cards

Term
Continental Drift
Definition
Continents drifted to their current location (from Pangaea)
Term
Who was the continental drift theory proposed by?
Definition
Alfred Wegner
Term
What were problems with Wegner's theory?
Definition
1) No proof
2) No explanation how it happend
Term
Fossil Clues
Definition
Similar plant and animal fossils found on both sides of the Atlantic Ocean
Term
Climate Clues
Definition
1) Glacial evidence in warmer climates
2) Fossils of ferns 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 proposed seafloor spreading?
Definition
Harry Hess (1960s)
Term
What was some proof of seafloor spreading?
Definition
1) Newer rocks near mid-Atlantic ridge
2) Magnetic clues in rocks
Term
Plate Tectonic Theory
Definition
Crustal sections (plates) move around on mantle
Term
Plates move by...
Definition
Convection currents
Term
Plate boundaries
Definition
Where plates meet
Term
Convergent
Definition
Plates come together
Term
Continental collision
Definition
Two continental (less dense) plates collide- Forms mountains
Term
Subduction
Definition
Denser oceanic plate goes under less dense continental plate
Term
Divergent
Definition
Plates spread apart
Term
Seafloor spreading
Definition
Two oceanic plates move apart
Term
Rift Valley
Definition
Two continental plates move apart
Term
Transform
Definition
Plates slide by each other
Term
An example of a transform boundary is?
Definition
San Andreas fault (California)
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