Earth Through Time

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