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15 Cards in this Set
- Front
- Back
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Lithosphere
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The rigid outer layer of Earth, including the crust and upper mantle.
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Asthenosphere
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A subdivision of the mantle below the lithosphere. Rock is easy deformed.
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Divergent Boundary
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Two plates move apart resulting in new sea floor from mantle.
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Rift Valley
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A region where divergence is taking place.
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Convergent Boundary
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A boundary in which two plates move together, resulting in oceanic lithosphere being thrust beneath the overriding plate.
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Subduction Zone
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A long narrow zone where one lithospheric plate descends beneath another.
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Continental Volcanic Arc
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Mountains formed in part by igneous activity associated with the subduction of oceanic lithosphere beneath a continent. Example is Andes and the Cascades.
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Volcanic Island Arc
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A chain of volcanic islands generally located a few hundred kilometers from a trench where there is active subduction of one oceanic plate beneath another.
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Trasform-Fault Boundary
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A boundary in which two plates slide past one another without creating or destroying lithosphere.
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Graben
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A valley formed by the downward displacement of a fault-bounded block.
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Horst
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An elongated, uplifted block of crust bounded by faults.
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Orogenesis
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The processes that collectively result in the formation of mountains.
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Terrane
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A crustal block bounded by faults whose geologic history is distinct from the histories of adjoining crustal blocks.
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Fault-Block mountains
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A mountain formed by the displacement of rock along a fault.
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Isostasy
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The concept that Earth's crust is floating in gravitational balance upon the material of the mantle.
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