| Term | Definition |
|---|
| earthquake | the shaking of the Earth's crust |
| faults | breaks along the earth's crust |
| seismographs | instruments that record earthquake waves |
| magnitude | the amount of energy given off by an earthquake |
| Richter scale | a way to measure the magnitude of an earthquake by using a rating system |
| volcanoes | a place where magma is pushed out through a weak place in the earth's crust |
| magma | very hot, sometimes liquid rock material below the surface of the earth |
| lava | hot melted matter from a volcano; also the same matter after it has hardened into rock |
| Alfred Wegener | believed that a giant continent broke apart to form our continents that exist today |
| mid-ocean ridges | mountain ridges at the bottom of the ocean |
| plate techtonics | the theory that the earth's features are caused by movement of large pieces of the earth's crust |
| trench | a very deep valley |
| San Andreas Fault | a place in Southern California where two plates are sliding towards each other |
Combine with other sets
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