Tectonic Hazards Key Terms

1. Continental crust is land and mainly composed of granite. It is less dense than oceanic crust, does not sink and is permenant (11, 5)
4. the point on the Earth's surface directly above the focus of an earthquake (9)
5. the point at which the pressure is released and the earthquake happens (5)
6. a fracture in the Earth's crust that shows signs of movement (5)
7. when magma hits the air, it becomes lava: a thick liquid which quickly cools and turns into rock (4)
8. tidal wave caused by an underwater earthquake (7)

2. Oceanic crust is covered by sea and mainly composed of sedimentary rock. It is more dense than continental crust and can sink (7, 5)
3. tall, conical volcano composed of many layers (6, 7)
9. smaller earthquakes that occur in the same general area during the days to years following a larger event (11)
10. semi-molten rock under the Earth's crust (6)

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