Across
- 2. A ____ happens when rock layers shift
- 4. Rock type that fossils form in
- 6. Earliest life on Earth started as one ____.
- 8. As asteroid likely hit Earth to make the ____ go extinct.
- 10. Happens when Earth changes quickly and many organisms die
- 11. Remains of a living organism
- 12. A ____ eruption can block sunlight from reaching Earth.
Down
- 1. When tectonic plates move it creates an ____.
- 3. A rock layer on top is _____ than those under it.
- 5. Rock that melts its way into other layers of rock
- 7. A ____ fossil shows that water used to be in an environment.
- 9. _____ rock has been melted and cooled.