History Earth/rocks

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Across
  1. 4. Rock at bottom=old Top=New
  2. 5. when all of one thing dies and that thing is no more
  3. 8. The age of the fossil in years
  4. 10. Only lived for a short amount of time
  5. 12. The age based on the rocks around the one you're looking at
Down
  1. 1. study fossils
  2. 2. Study rocks
  3. 3. the surface where new rock meets old
  4. 6. A break in the earths crust
  5. 7. where fossils are found
  6. 9. Looks like a cockroach and Is also an index fossil
  7. 11. Very old rocks that had a life