Across
- 2. a sheet, quantity, or thickness of material, typically one of several, covering a surface or body
- 5. crash together with violent impact
- 7. relating to or forming part of the structure of a building or other item
- 9. a continent or other large body of land
- 12. subject to or caused by an earthquake or earth vibration
- 15. reduce or cause to be reduced from a solid to a liquid state
- 17. the movement or study of the movement of Earth's crust
- 18. another word for disengage
- 19. the process of covering the earth with glaciers or masses of ice
- 20. a sudden outbreak of something, typically something unwelcome or noisy
Down
- 1. a strike-slip fault occurring at the boundary between two plates of the earth's crust
- 3. a biological community of interacting organisms and their physical environment
- 4. a specialist in the history of the Earth recorded in rocks
- 6. a mobile, destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud and advancing beneath a large storm system.
- 8. a celestial body moving in an elliptical orbit around a star
- 10. the regions of the Earth where living organisms exist
- 11. any of the world's main continuous expanses of land
- 13. a sheet of floating ice
- 14. a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust
- 16. liquid rock