| A | B |
|---|
| Earth’s crust | the outermost layer of rock on the earth |
| Sediment | small, solid fragments of rock and other materials that are carried and deposited by wind, water, and ice. Examples would be sand, mud, or gravel. |
| Sedimentary rock | rock forms 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 |
