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the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.

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In geology, a fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement as a result of rock-mass movement.

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A transform boundary (or conservative boundary) is where two of the tectonic plates slide alongside each other.

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divergent plate boundary in Science. divergent plate boundary. (dĭ-vûr'jənt) A tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates.

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convergent plate boundary in Science. convergent plate boundary. (kən-vûr'jənt) A tectonic boundary where two plates are moving toward each other.

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The Ring of Fire is a major area in the basin of the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur.

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a north-south suboceanic ridge in the Atlantic Ocean from Iceland to Antarctica on whose crest are several groups of islands; shown by plate tectonics to be the axis along which North America has split away from Eurasia, and along which South America has split away from Africa.

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There are three types of plate boundaries: spreading zones, transform faults, andsubduction zones. Earthquakes Kaye M. Shedlock. subduction zones are found where one plate overrides, or subducts, another, pushing it downward into the mantle where it melts.

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the gradual movement of the continents across the earth's surface through geological time.

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Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core.