Tectonic plates

1. A way of determining the effects of an earthquake on humans buildings and the local landscape. Measured in Roman Numerals.
5. A conservative plate boundary where at the Pacific plate moves past the North American plate at different rates.
7. A small quake detected before the main earthquake which can be detected using seismometers.
8. When a more dense plate moves beneath a less dense plate.
9. An earthquake formed by the subduction of the Nazca plate beneath the South American plate.
10. Animals acting strangely can be used as a form of....
12. The location of the earthquake below the earth's crust.
14. Often used in earthquake prone countries as a precaution before the main event.
18. Used to detect movement in rocks before earthquakes.

2. The point on the earths surface directly above the focus of an earthquake.
3. A smaller quake following the main shock.
4. The cause for the movement of tectonic plate. Caused because of the radioactive decay of elements since the formation of the earth.
6. A chain of islands formed by the movement of the Pacific plate above a hotspot.
7. A type of volcano which erupts gently and non-explosively.
10. A longitudinal wave often used to detect earthquakes.
11. A source of income for people who live near volcanoes.
13. A type of energy which can be produced near volcanic regions.
15. A plume of heat forming in the mantle, rising to the crust.
16. A way of measuring the magnitude of an earthquake. A logarithmic scale
17. A transverse wave which causes most destruction.