| Question | Answer |
| Def. Peridotite | Rock carried up to surface by lava |
| Earths Average density? | 5.5 t/m3 |
| Crusts average density? | 2.7 t/m3 |
| Def Focus | Point where breaking rocks occur on the fault |
| Def. Epicenter | Point on surface directly above focus |
| P-Wave? | Subsurface primary wave |
| S-Wave? | Subsurface secondary wave |
| Shock wave velocity? | increases with rigidity, decreases with density |
| What happens to shockwaves at boundaries within the earth? | they get refracted |
| The asthenosphere? | 'low velocity zone' 100 - 300kms deep |
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Spanish 3
