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8 Cards in this Set
- Front
- Back
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astenosphere
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plasticlike layer of the Earth on which the litosphere plates float and move around
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Continental Drift
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Weagner's hypothesis that all continents were once conected in a single large landmass that broke apart about 200 milion years ago and drifted slowly to their current postions.
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Convection Current
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current in Earth's mantle that transfers heat in the Earth's interior and s he driving force for plate tectonics
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Lithosphere
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rigid layer of the Earth about 100 km thick, made of the crust and the upper mantle.
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Pangaea
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large ancient landmass that was composed of all the continents joined together
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Plate
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a large section of the Earth's oceanic or continental and rigid upper mantle that moves around on the asthensphere.
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Plate Tectonics
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Theory that the crust and the upper mantle are broken plates that float and more around on a plasticlike layer of the mantle.
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Seafloor Spreading
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Hess's theory that the new seafloor is forming when magma is forced upward toward t5he surface at a mid-ocean ridge.
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