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25 Cards in this Set
- Front
- Back
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continental drift
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a hypothesis proposed by Alfred Wegener, stating that the continents had moved and once formed part of a single landmass, which he named Pangaea
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convenction
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transfer of heat through the movement of heated material
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convenction current
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movement in a fluid caused by uneven heating
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convergent boundary
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border formed by the collision of two lithospheric
plates |
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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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Pangaea
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single landmass thought to have been the origin of all continents
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Panthalassa
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giant ocean surrounding Pangaea
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plate techtonics
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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 separate
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seafloor 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 moves under another
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terrane
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piece of land with a geologic history distinct from that of the
surrounding land |
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theory of suspect terranes
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theory that continents 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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tectonics
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the study of formation of features in the earth's crust (comes from the Greek word tektonikos)
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subduct
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force
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ocean-ocean convergent
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one plate goes under, the other goes over (subduction results)
forms trench & island arc examples: Japan, Philippians, Aleutian Islands, Indonesia, Malaysia |
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diverge
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crust pulls apart
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convergent
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crust comes together
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transform
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crust slides past one another
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ocean-continental convergent
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one plate goes under, the other goes over (example: Andes)
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