| 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 |
Ch.18 LTI-MA 509
