Volcanoes

3. Layer above the outer core
7. Large ocean wave created by undersea earthquakes or volcanic eruptions.
8. A volcano that will not erupt again.
9. The zone of earthquakes and volcanoes surrounding the Pacific Ocean.
11. Molten rock that is found beneath the earth's surface.
14. Force that drives plate tectonics
16. Mountains formed from the build-up of volcanic lava often take this shape.

1. Volcano that doesn't form on plate boundaries
2. A fissure at the earth's surface through which magma and gases erupt.
4. Thinnest layer of the Earth
5. A type of volcano with broad, gentle slopes and built by the eruption of fluid basalt lava.
6. Molten rock that erupts from volcanoes.
10. Older, lighter plate
12. A volcano that is erupting or has erupted recently
13. Younger, heavier plate
15. A volcano that has not erupted recently, but may do so in the future.