Across
- 2. rock formed under great heat and pressure within Earth's crust
- 5. time when extensive ice fields covered the polar regions
- 6. crack in the Earth's crust
- 7. elevation differences between different areas
- 8. Region of the earth between the crust and the core
- 9. hot central part of the Earth below the mantle
- 10. outer layer of the earth
- 15. hypothetical landmass that existed when all continents were joined
- 16. shaking of the ground caused by sudden movement of the earth's crust
- 18. hot fluid rock erupted from a volcano
- 19. remnant or trace of a prehistoric organism
- 20. arrangement of physical features of an area
- 21. gradual loss of surface soil
Down
- 1. slowly moving mass of ice formed over many years
- 3. layers of the Earth's crust that travel independently over the mantle
- 4. rock formed by the cooling and solidification of lava
- 11. long narrow hilltop or mountain range
- 12. large underground chamber
- 13. hot fluid rock below the Earth's crust
- 14. mass of sediment deposited at the mouth of a river
- 17. loss of snow or ice from a glacier