| A | B |
|---|
| lithosphere | the solid rocky outer layer of the earth that includes the crust. |
| plate tectonics | theory that states that the lithsphere is broken into plates that move. |
| fault | a crack in the earth's crust along which rock moves. |
| focus | the point along a fault where rock first breaks or moves,causing an earthquake. |
| seismorgraph | instrument that records the strenghs of the earth's movements,based on the amount of energy released . |
| Richter scale | a scale used to compare the strenghths of earthquakes. |
| drainage basin | the land area from which a river system gets its water. |
| sediments | rock and soil carried by water. |
| groundwater | water in the ground near Earth's surface. |
| aquifer | a layer of rock in which ground water can accumulate and flow freely. |
| water table | the top of an aquifer. |
| glaicer | a large mass of moving ice. |
| moraine | a ridged formed when a glaicer deposites its sediments. |
| index fossil | a fossil of an organism that existed on earth for a short time over a large geographic area. |
| geographic time scale | a record of earth's history based on events interupted from the rock record and fossil evidence. |
