Across
- 4. unable to maintain
- 6. impact a theory explaining dinosaur extinction
- 9. kill, destroy, or remove a large percentage or part of
- 11. element found only in space
- 12. to prove wrong
- 13. a dead body
- 14. a method to explain, predict, and understand phenomena
Down
- 1. confirm or give support
- 2. scientist who studies the history of life on Earth through the fossil record
- 3. to bring to an end
- 5. small vertebrates that need water, or a moist environment to survive
- 7. impact a meteor comet or asteroid colliding with earth
- 8. the variety of life on earth
- 10. destroy completely put an end to