Science

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Across
  1. 4. What you live on.
  2. 7. compacted and cemented together
  3. 8. Large reptiles that died from the mass extinction.
  4. 11. The color of powder left behind.
  5. 12. A large mass of stone forming in the earth
  6. 13. Remains that have been incased in a rocks structure.
Down
  1. 1. A rock with atoms arranged in a orderly fashion.
  2. 2. makes up eras
  3. 3. formed when molten rock cools and hardens
  4. 5. formed when a rock changed due to heat or pressure
  5. 6. Any of a class of substances occurring in nature.
  6. 9. a long period of time
  7. 10. a thickness of some mineral placed on top of each other