| Term | Definition |
| siesmograph | measures size of earthquake waves |
| primary waves | fastest waves: compression waves |
| secondary waves | second fastest waves; move side to side and up and down |
| surface waves | slowest waves; cause the most destruction |
| focus | the point beneath earth's surface where rock under stress breaks and triggers an earthquake |
| epicenter | point on earth surface directly above where an earthquake occurs |
| subduction | oceanic plate goes under a continental plate when they converge |
| anticline | upward fold in a rock formed by compression of earth's crust |
| syncline | downward fold in rock formed by compression of earth's crust |
| geology | study of earth |
| convection | heat transfer through fluids |
| radiation | heat transfer through space |
| conduction | heat transfer through direct contact |
| divergent boundaries | two plates moving away from each other |
| convergent boundaries | two plates move toward each other |
| layers of the earth | crust, mantle, outer core, inner core |
| strike slip fault | shearing |
| normal fault | hanging wall goes down; tension |
| continental drift | hypothesis that continents slowly move across earth's surface |
| sea floor spreading | sea floor spreads apart along both sides of mid ocean ridge as new crust is added |