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