Plate Tectonics
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| Alfred Wegner's theory that the continents slowly moved over Earth's surface to their current locations. | CONTINENTAL DRIFT
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| Earth's crust and upper mantle are broken into sections that continents and ocean floors are carried on. | PLATES
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| Two plates SLIP past each other (earthquakes can occur). | TRANSFORM BOUNDARY
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| An underwater mountain chain that extends into all of the oceans on Earth. | MID-OCEAN RIDGE
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| Solid layer of Earth made of the crust and part of the upper mantle. | LITHOSPHERE
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| The plates of the lithosphere float and move around on the _____________, which is made of solid rock that flows like a thick liquid. | ASTHENOSPHERE
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| Old crust is pushed downward and sinks in the mantle. | SUBDUCTION
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| Deep crack running down the center of the Mid-Atlantic ridge. | RIFT VALLEY
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| Process that slowly adds new rock to the ocean floors. | SEA-FLOOR SPREADING
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| The movement of a gas or liquid caused by differences in temperature. | CONVECTION CURRENTS
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| Two plates move APART (rift valley and mid-ocean ridges form). | DIVERGENT BOUNDARY
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| All the continents that were once joined together in a supercontinent, meaning "all lands". | PANGAEA
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| Two plates COME TOGETHER or COLLIDE (volcanic mountain and deep-ocean trenches form). | CONVERGENT BOUNDARY
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| A device that scientists used to map the ocean floor. | SONAR
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