Rock Puzzle

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Across
  1. 1. element that helps immune system
  2. 4. twin mines
  3. 5. level 10 hardness
  4. 7. study of rocks
  5. 9. made from Earth debris
  6. 12. component of limestone
  7. 14. way to tell what a rock is
  8. 15. more than 90% of volcanic rock on Earth
  9. 17. swiss cheese rock
  10. 19. solid pure form
  11. 20. Decorah
  12. 21. nonmetallic rock
  13. 22. lowest layer in minecraft
  14. 23. big rock
  15. 25. preserved remains
Down
  1. 2. began as sediment and cemented together
  2. 3. don't judge a book by it's cover
  3. 6. sidewalk
  4. 7. rough road
  5. 8. thought to heal
  6. 10. used in drywall, paint, and cars
  7. 11. small rock
  8. 13. main source of the material lime
  9. 16. birthstone of February
  10. 18. rocks from volcano
  11. 24. mass of minerals