| A | B |
|---|
| convergent boundary | when two plates slide toward each other |
| divergent boundary | when two plates slide away from each other |
| fault | a break in the earth's crust |
| focus | the underground piont where an earthquake takes place |
| epicenter | the point on the surface directly over the focus |
| richter scale | earthquake magnitude scale |
| crater | a steep-sided depression at top of a volcano |
| geyser | heated groundwater that spews from earth's crust |
| plate boundary | place where two plates meet |
| crust | outer most portion of the earth |
| lithosphere | the earth's crust and part of the mantle |
