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17 Cards in this Set
- Front
- Back
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Word
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Definition
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Crust
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solid, thin outer layer 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 the broke apart 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 plated 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 temperature
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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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