| A | B |
|---|
| Geology | the study of the earth's physical study and history |
| core | earth's center consisting of very hot metal that is dense and solid in the inner core in molten and liquid in the outer core |
| mantle | a thick layer of mostly solid rock beneath the earth's crust that surrounds the earth's core. |
| magma | molten or liquid rock in the earth's mantle |
| crust | the solid, rocky , surface layer of the earth.(outer layer) |
| continents | any of the seven large landmasses of the earth's surface. |
| relief | differences in elevation or height of landforms in any particular area |
| plateau | a raised area of mostly level land with at least one side rises steeply above the surrounding land. |
| plain | a flat or gently rolling area with few changes in elevation. |
| lava | magma or molten rock from the earth's mantle that breaks through the surface of the earth during volcanic activity. |
| fault | a fracture or break in the earth's crust. |
| plate tectonics | the theory that the earth's outer shell is composed of a number of large unachored plates |
| continental drift theory | the idea that continents slowly shift their postition due to the movement of the tectonic plates on which they ride |
| fossils | preserved remains or imprint of animal or plant from a previous geological period |
| rift valley | a large split along the crest of a under water mountain system where smalll earthquakes and volcanic eruptions frequently occur. |
| convection | a circula movement caused when material is heated expands and rises then cools and falls |
| subduction zone | an area where two tectonic plates meet and one plate sinks up under the other |
