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| theory that suggested that continents have moved slowly to their current locations |
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| Seafloor spreading occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. Seafloor spreading helps explain continental drift in the theory of plate tectonics. |
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| a long, steep-sided, narrow depression in the ocean floor |
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| a converging plate boundary where one plate subducts beneath another, usually because it's denser; a trench is formed there; caused when an oceanic and a continental plate collide |
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| boundary where plates move apart; seafloor spreading occurs at this type of boundary |
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| boundary where plates move towards each other |
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| boundary where two plates slide past each other |
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