| Answer |
Question |
| HOT SPOT | area of volcanic activity that develops above rising plumes of magma |
| SUBDUCTION | one plate sinking beneath another |
| OCEANIC-CONTINENTAL SUBDUCTION | a plate with oceanic crust sinking under a plate with continental crust |
| OUTER CORE | layer of liquid metals that surrounds the inner core |
| CONVECTION | the motion created when heated material continually rises, cools and sinks |
| CRUST | thin layer of rock that surrounds Earth |
| CONTINENTAL-CONTINENTAL COLLISION | occurs where plates with continental crust push together |
| INNER CORE | a ball of hot, solid, metals at Earth’s center |
| CONVECTION CURRENT | the transfer of heat within a material |
| OCEANIC-OCEANIC SUBDUCTION | a plate with oceanic crust sinking under another plate with oceanic crust |
| PANGEA | the name that Alfred Wegener gave to the huge supercontinent that he proposed had once existed |
| THEORY OF PLATE TECTONICS | theory states that Earth's lithosphere is broken into huge, moving slabs of rock driven by motions in the mantle. |
| CONTINENTAL DRIFT | hypothesis formed by Wegener that said Earth’s continents were once joined in a single landmass and gradually moved or drifted apart. |
| MANTLE | the earth's thickest layer,2900 km (1700mi), layer of rock between Earth's outer core and crust |
| LITHOSPHERE | layer make up of the crust and the top part of the mantle about 40 km thick and broken into tectonic plates |
| TECTONIC PLATE | lithosphere broken into many large and small slabs of rock |
| ASTHENOSPHERE | layer of hotter, softer rock in the upper mantle and directly under the lithosphere |
| MID-OCEAN RIDGE | huge underwater mountain ranges, appear in every ocean, circling Earth. |
| DIVERGENT BOUNDARY | boundary along which two tectonic plates move apart, found in the ocean. |
| RIFT VALLEY | a deep valley formed as tectonic plates move apart |
| MAGNETIC REVERSAL | switch in the direction of earth's magnetic field so that the magnetic north pole becomes the magnetic south pole and the magnetic south pole becomes the magnetic north pole |
| CONVERGENT BOUNDARY | a boundary along which two tectonic plates push together, characterized either by subduction or a continental collision |
| TRANSFORM BOUNDARY | boundary along which two tectonic plates scrape past each other and crust is neither formed nor destroyed |
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