Dynamic Earth

2. waves, The fastest waves produced by an earthquake.
3. An opening in a weak part of the Earth’s crust in which lava, steam, gases or ash is ejected
6. A type of rock formed from cooled magma.
10. Metamorphism that occurs to rock near magma.
11. The instrument used to record earthquakes.
12. A type of rock which is formed by the compaction and cementation of sediments.
15. A type of volcano which has steep sides and sticky, high viscosity lava.
16. The name for the scale used to measure earthquake magnitude.
17. thickest internal layer of the Earth.
18. core, The hottest internal layer of the Earth.
19. tectonics, The theory that the crust is split into several plates which move due to mantle convection currents.

1. chamber, The name of the reservoir of magma within the earth's crust beneath a volcano.
2. Igneous rock that has cooled in the crust.
4. A type of rock that forms due to high pressures and temperatures.
5. Sedimentary rocks often have a lot of ______________.
7. A type of weathering that is caused by animals or plants.
8. The type of plate boundary found near the North Island.
9. The point on the Earth's surface directly above where an earthquake originated.
13. A volcano that has not erupted recently but is expected to do so at some point is known as ___________________.
14. A volcano which has erupted recently or is currently erupting.