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| The soft layer of the mantle on which the plates move |
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| The strong, lower part of the mantle between the asthenosphere and the outer core. |
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| the liquid layer of the Earth's core that lies beneath the mantle and surrounds the inner core. |
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| The hypothesis that states that the continents once formed a single landmass, broke up and drifted to their present locations |
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| The theory that explains how large pieces of the Earth's outermost layer, called tectonic plates, move and change shape. |
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| the boundary formed by the collision of two plates. |
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| The boundary between two tectonic plates that are moving away from each other. |
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| The process by which new oceanic land forms as magma rises toward the surface and solidifies under the ocean. |
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| a cycle that occurs as hot rock expands and rises to the surface, the cool rock becomes dense and sinks. ex. lava lamp |
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