Plate Tectonics Definitions

1. Material ejected from volcanoes which is rich in silica, very viscous, explosive and forms cones at destructive plate margins. (4, 4)
6. Surface seismic waves which cause the ground to move sideways. (4, 4)
7. Black volcanic glass. (8)
8. The process of fold mountain building by horizontal folding of sediments followed by vertical uplift. (10)

2. Transverse waves are slower and arrive second in earthquakes. Also known as S waves. (9, 5)
3. A source of unpredictable, unplanned danger to people. (6)
4. The location, in the crust of the earthquake, frequently at 70km depth. (5)
5. The largest and deepest mass of igneous rock forced into the crust. (9)
9. Opening at the summit of a volcano through which material is ejected. (4)
10. Earthquakes that follow the largest shock of an earthquake sequence. (11)

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