Across
- 3. Burnt material that shoots out of the top of a volcano.
- 5. A bowl-shaped depression at the mouth of a volcano or geyser.
- 10. A very large ocean wave caused by an underwater earthquake or volcanic eruption.
- 12. The part with the highest elevation
- 13. A sudden violent shaking of the ground, typically causing great destruction.
- 15. Convection currents are continuous movements of water caused by the expansion of the water as its temperature rises.
- 16. The outer part of the earth, consisting of the crust and upper mantle.
- 18. Neither extinct nor erupting.
- 19. The sudden occurrence of a violent discharge of steam and volcanic material.
- 20. An occurrence causing widespread destruction and distress.
- 21. The process by which material from the earth's surface is worn away by forces such as glaciers, wind, and waves.
Down
- 1. The point on the earth's surface directly above the focus of an earthquake.
- 2. A long narrow steep-sided depression in the earth's oceanic crust.
- 4. A geologic process in which one edge of one crustal plate is forced below the edge of another.
- 6. An opening in the earth's crust through which molten lava, ash, and gases are ejected.
- 7. The molten rock material under the earth's crust.
- 8. A light, porous, glassy lava.
- 9. The rock formed by the cooling and solidifying of molten rock.
- 11. The theory that Earth's outer shell is divided into several plates that glide over the mantle.
- 14. An opening which allows entrance, passage, or exit of a gas or vapour.
- 17. An underwater mountain system that consists of various mountain ranges.