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20 Cards in this Set
- Front
- Back
Continental drift
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hypothesis stating that the continnents once formed a single landmass, broke up, and drifted to their present locations. (Contending that all of the present day continents were connected side-by- side, as long ago as the carboniferous 300 million years)
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Pangea
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single landmass thought to have been the oringin of all contunents
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Panthalassa
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giant ocean surrounding Panagea
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Mesosaurus
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a small extinct land reptile that lived 270 million years ago
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Mid-Atlantic ridges
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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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Seafloor spreading
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movement of the ocean floor away from either side of a mid-ocean ridge
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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 convectioncurrents
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Oceanic crust
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material that makes up the ocean floor
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Continental crust
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material that makes up landmass
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Lithosphere
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thin outer shell of the Earth consisting of the crust and the ridged upper mantle
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asthenosphere
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zone of mantle beneth the lithosphere that consists of slowly flowing solid rock
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tectonics
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is the study of formation of features in the Earth's crust
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divergent boundaries
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boundary formed by two lithospheric plates that are moving apart
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rift valley
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steep, narrow valley formed as a lithosphiric plates sperate
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convergent boundary
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border formed by direct collision of two lithospheric plates
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subduction zone
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region where one lithospheric plate moves under another
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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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island arc
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chain of volvanic lisland formed along an ocean trench
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transform fault boundary
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boundary formed where 2 lithospheric plates alides past each other
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