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8 Cards in this Set
- Front
- Back
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Pangea
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Large, ancient landmass, all continents joined together
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Continental Drift
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Wegner's hypothesis that all continents once together drifted apart
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Seafloor Spreading
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Hess; theory, when magma is forced to the surface at a mid-ocean ridge, new seafloor is formed
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Plate tectonics
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Theory, Earth's crust and upper mantle are broken into sections (plates), they float and move on a plastic layer of mantle
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Plate
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a large section of Earth's crust and upper mantle that moves on the asthenosphere
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lithosphere
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rigid (hard) layer of Earth, made of crust and part of the upper mantle
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asthenosphere
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plastic-like layer of Earth on which the lithosphere floats
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Convection current
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current(movement)in Earth's mantle that transfers heat in Earth's interior, the force behind plate tectonics
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