| A | B |
|---|
| Earth's crust | Earth's outermost layer of rock |
| Sediment | Small, solid fragments of rock and other materials that are carried and deposited by wind, water, or ice. Examples would be sand, mud, or gravel. |
| Sedimentary rock | Rock formed when chemical reactions cement sediments together, hardening them |
| Igneous rock | Rock that forms from molten rock |
| Metamorphic rock | Igneous or sedimentary rock that has been changed into a new kind of rock as a result of great pressure and temperature |
| Plastic rock | Rock that behaves like something between a liquid and a solid |
| Earthquake | Vibration of the earth that results either from volcanic activity or rock masses suddenly moving along a fault |
| Fault | The boundary between two sections of rock that can move relative to one another |
| Focus | The point where an earthquake begins |
| Epicenter | The point on the surface of the earth directly above an earthquake's focus |
