Geology

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Across
  1. 5. something that is tough
  2. 6. a precious stone
  3. 8. a dark natural glass
  4. 9. a very light and porous volcanic rock
  5. 10. a science that deals with the history of earth
  6. 13. the natural and physical attributes of land
  7. 15. an opening in the Earth's crust
  8. 17. rocks that came from inside the earth
  9. 18. a dark fine-grained volcanic rock
Down
  1. 1. the remains or impression of a plant or animal granite
  2. 2. pieces of bigger rocks
  3. 3. a metamorphic rock made of recrystallized carbon mineral
  4. 4. rock that is formed chiefly organic remains
  5. 7. between the core and the crust
  6. 11. transformation of a pre-existing rock
  7. 12. molten rock material under the Earth's crust
  8. 14. the outermost layer of a planet
  9. 16. a large natural elevation of the earth's surface