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15 Cards in this Set
- Front
- Back
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The rigid outer layer of Earth, including the crust and upper mantle.
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Lithosphere
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A subdivision of the mantle situated below the lithosphere.
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Asthenosphere
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A boundary in which two plates move apart, resulting in upwelling of material from the mantle to create new seafloor.
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Divergent plate boundaries
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A region of Earths crust along which divergence is taking place.
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Rift
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A boundary in which two plates move together.
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Convergent plate boundaries
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A long, narrow zone where one lithospheric plate descends beneath another.
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Subduction zone
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Mountains formed in part by igneous activity associated with the subduction of oceanic lithosphere beneath the continent.
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Continental volcanic 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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Volcanic island arc
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A boundary in which two plates slide past one another without creating or destroying lithosphere.
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Transform-fault boundary
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A valley formed by the downward displacement of a fault-bounded block.
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Graben
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An elongated, uplifted block of crust bounded by faults.
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Horst
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The processes that collectively result in the formation of mountains.
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Orogenesis
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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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Terrane
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A mountain formed by the displacement of rock along a fault.
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fault-block mountain
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The concept that earths crust is floating in gravitational balance upon the material of the mantle.
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Isostasy
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