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22 Cards in this Set
- Front
- Back
asthenosphere
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zone of the universe beneath the lithosphere that consists of slowly flowing solid rock
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continental crust
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matieral that makes up landmasses
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continental drift
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hypothesis stating that the contients once formed a single landmass,broke up, and drifted to their present locations
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convection
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transfer of heat through the movement of a fluid matieral
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convection current
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movement in afluid caused by uneven heating
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convergent boundary
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borderformed by the direct collision of two lithospheric plates
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divergent boundary
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boundary formed by two lithospheric plates that are moving apart
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island arc
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chain of volcanic islands formed along an ocean trench
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lithosphere
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thin outer shell of the earth consisting of the crust and the rigid upper mantle
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Mid-Atlantic Ridge
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undersea mountain range with a steep,narrow valley along its center
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mid ocean ridges
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system of undersea mountain ranges that wind around the earth
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ocean trench
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deep valley in the ocean floor that forms along a subduction zone
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oceanic crust
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matieral that makes up the ocean floor
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Pangea
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single landmass thought to ahve been the origin of all continents
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Panthalassa
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giant ocean surrounding Pangea
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plate tectonics
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theory that the lithosphere is made up of plates that float on the asthenosphere and that the plates possibly are moved by convection currents
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rift valley
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steep, narrow valley formed as lithospheric plates seperate
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sea floor spreading
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movement of the ocean floor away from either side of a mid-ocean ridge.
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subduction zone
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region where one lithospheric plate move under another
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terrane
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piece of land with a geologist history distinct from ofd the surrounding land.
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theory of suspect terranes
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theory that continets are a patchwork of pieces of land that have individual geologic histories
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transform fault boundary
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boundary formed where two lithospheric plates slide past each other
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