Plate Tectonics Definitions

1. The narrow crust of the earth which forms the outer layer is made of at least 16 rigid areas called plates. (12, 5)
2. Magma which forces its way to the Earth's surface and erupts. (4)
5. A horizontal structure of igneous rock continuous with layers of rocks, where magma is forced along bedding planes. (4)
6. Forms where two parallel down faults have formed a trough, which are caused by the intense doming up of magma in the crust below. (4, 6)
7. Scientist who thought that the continents where once one super continent. (7)

2. A process by which water-saturated sediment temporarily loses strength and acts like a fluid. (12)
3. Longitudinal waves are fastest to arrive in earthquakes. (7, 4)
4. The study of earthquake tremors and their power. (12)
9. Points in the oceans where molten material from the mantle breaks through to the surface, caused by convectional plumes e.g. Hawaiian Islands. (3, 4)
10. Seismic caused sea waves 95% caused by earthquakes and few by volcanoes under the sea. (7)

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