Earth Through Time

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Across
  1. 2. _______________ time scale is used to organize Earth's long history
  2. 3. to learn about changes in Earth's past, we can look to the ___________.
  3. 6. not all fossils are found in rock. They can also be found in this
  4. 7. the Era we are currently in
  5. 9. Earth is about 4.6 _____________ years old
  6. 11. the Period we are currently in
  7. 12. how old something is compared to how old something else it
  8. 17. the Epoch we are currently in
  9. 18. a gap in the rock record
  10. 19. the Eon we are currently in
Down
  1. 1. what scientists use to date the age of the Earth
  2. 4. rock made of tiny rock pieces
  3. 5. if undisturbed, sedimentary rocks stay in this direction
  4. 8. the law that states oldest rock in on the bottom, youngest at the top
  5. 10. the remains of an organism that was common and widespread
  6. 13. all of Earth's known rocks and the information they contain
  7. 14. identifies how old an object is, as expressed in units of time
  8. 15. cooled magma that cuts across existing rock
  9. 16. cooled ash from the supervolcano in Yellowstone