Across
- 3. Appeared 550,000,000 years ago.
- 5. Is the shortest period in history.
- 9. A metamorphic rock that was formed from slate
- 10. Happened 270,000,000 years ago.
- 12. Metamorphic rock that formed when sandstone, a sedimentary rock, changes due to heat
- 13. A drop of acid on a rock will fizz if it contains this.
- 14. Appeared 200,000 years ago.
- 15. a graphic representation of the passage of time as a line.
- 16. Formed when molten rock cools and hardens
Down
- 1. Igneous rock that is made of volcanic glass
- 2. Appeared 420,000,000 years ago.
- 4. Igneous rock that looks dull and feels rough
- 6. Is 52 miles away from lee's ferry.
- 7. Is the longest era in history
- 8. Appeared 245,000,000 years ago.
- 10. Formed 6,000,000 years ago, was carved by the Colorado river, and is a mile deep
- 11. 20 miles away from lee's ferry.