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8 Cards in this Set
- Front
- Back
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asthenosphere
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plastic like layer of Earth on which lithosphere plates float and move around.
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continental drift
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Wegner's hypothesis that all continents were once in a single large landmass that broke apart about 200 million years ago, and drifted slowly to their current positions.
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convection currents
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current in Earth's mantle that transfers heat in Earth's interior and is the driving force for plate tectonics.
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lithosphere
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rigid layer of Earth about 100km thick, made up of the crust and part of the upper mantle.
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Pangea
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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 Earth's oceanic or continental crust, and upper mantle that moves around on the astenosphere.
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plate tectonics
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theory that Earth's crust and upper mantle are broken up into plates that float and move around on a plastic like layer of the mantle
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seafloor spreading
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Hess's theory that new seafloor is formed when magma is forced upward towards the surface at mid-ocean ridge.
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