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8 Cards in this Set

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