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15 Cards in this Set
- Front
- Back
plate tectonics
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the theory that the lithosphere is made up of plates that float on the asthenosphere and that the plates a possibly moved by convection currents
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oceanic crust
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The material that makes up the ocean floor
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continental crust
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The material that makes up landmasses.
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lithosphere
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The thin outer-shell of the earth consisting of the crust and the rigid upper mantle.
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asthenosphere
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The zone of the mantle beneath the lithosphere the consists of slowly flowing solid rock.
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divergent boundary
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A boundary formed by 2 lithospheric plates that are moving apart.
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rift valley
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A steep, narrow valley formed as lithospheric plates separate.
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convergent boundary
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A border formed by the collision of 2 lithospheric plates.
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subduction zone
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A region where one lithosphere plate moves under another
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ocean trench
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A deep valley in the ocean floor that forms along a subduction zone.
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island arc
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A chain of volcanic islands form along an ocean trench
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transform boundary
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A boundary formed where 2 lithospheric plate slide past each other
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convection current
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The movement in a fluid caused by uneven heating
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theory of mircoplate terranes
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The theory that continents are a patchwork of pieces of land that have individual geological histories.
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terranes
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A piece of land with a geologic history distinct from that of the surrounding land.
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