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16 Cards in this Set
- Front
- Back
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Crust
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Solid, thin outer most lauer of Earth.
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Mantle
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Thick layer of Earth below the crust.
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Core
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Innermost region of Earth.
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Continental drift
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Theory that the continents were at one or more times a single landmass that broke apar and eventually moved into the positions they are in today.
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Pangaea
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Single, giant landmass, or continent, that later broke apart.
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Mid-ocean ridge
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Ocean-floor feature resembling a mountain ridge on land.
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Rift valley
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Flat area between two ridges that is formed by spreading plates.
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Seafloor spreading
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Process that forms new seafloor.
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Trench
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Deep canyon.
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Subduction Zone
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Place where old oceanic crust is forced back down into an ocean trench.
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Tectonic plates
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Large, solid piece of Earth's surface.
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Theory of Plate Tectonics
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Theory that Earth's crust is broken into plates that float on the upper part of the mantle.
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Convection current
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Movement of a gas or a liquid caused by changes in teperature.
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Plate boundary
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Place where two plates meet.
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Magma chamber
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Underground pocket of molten rock.
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Hot Spot
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Place where magma reaches the surface of a tectonic plate.
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