| A | B |
|---|
| igneous | born of fire |
| sedimentary | formed from accumulation of sediments |
| absolute age | exact age |
| cast | when sediment fills a mould |
| composite cone | layers of lava and cinder |
| conglomerate | formed of pebbles and small stones |
| continental drift | theory explaining world map |
| crust | outer layer of earth's surface |
| crystal | piece of solid with straight edges, flat sides, and regular angles |
| earthquake | violent vibrations of the earth's surface |
| epicenter | point on the earth's surface the point of origin of an earthquake |
| fault | a break in the earth's crust |
| focus | the point underground where energy is first released |
| fossil | rock like remains of an organism |
| geology | the study of the earth |
| compression | when a load squeezes or pushes |
| metal fatigue | weakening of material caused by too much stress |
| stress | force exerted on an object by a load |
| structure | assembly of parts arranged in a particular way |
| tension | the effect of a load that pulls |
