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23 Cards in this Set

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  • Back
(deep ocean) A very deep, long depression in the sea floor marking a subduction zone.
Accreted terrane:
A portion of a plate added to a larger block of crust along a convergent plate boundary.
The separation of formerly continues features across a fault.
The separation of formerly continues features across a fault.
Passive continental margins:
A continental edge far from active plate boundaries.
The region of the mantle about 100 to 250 km beneath Earth’s surface where rocks are plastic and easily deformed. Mushy and flows.
The earth’s rigid outer 100 kilometers, including crust and outer mantle.
Convection currents:
The movement of liquid and gas in which hot, less dense materials rise and colder, denser materials sink.
A general term for folding, faulting, and other changes in rocks, sediments, and the land surface that take place in response to stress.
Stress resulting from forces directed toward each other.
Reverse fault:
A fault along with one side is moved up over the other side as a result of compression.
Thrust fault:
A type of reverse fault in which the fault surface is only slightly inclined.
Stretching that occurs in response to stresses directed away from each other.
Normal faults:
A fault that drops one side down relative to the other as a result of extension.
Shear stress:
Forces causing two blocks of rock or other material to move past each other.
combination of compression and transform movement.
Plate Tectonics:
The concept that the Earth’s lithosphere consists of a number or rigid, mobile pieces (plates) riding over the more plastic asthenosphere.
The thin, outer layer of the Earth, composed mostly of silicate minerals; upper part of Earth’s lithosphere.
The thickest of Earth’s layers, between the crust and the core, composed of more dense silicate minerals than the crust.
Divergent Plate Boundary
The line where two plates meet as they move apart from each other.
Seafloor spreading:
The divergent motion and creation of oceanic crust caused by rising magmas along divergent plate boundaries.
Convergent plate boundary:
The lines where two plates meet as they move towards each other.
The process by which an oceanic plate is driven beneath another plate into the mantle along a convergent boundary.