geological time scale

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Across
  1. 4. the actual age of a rock
  2. 5. piece of the earth broke off and became the moon
  3. 8. in an undisturbed sequence of rocks the oldest rocks are at the bottom and the newest are at the top
Down
  1. 1. any feature that cuts across a sequence of rocks is younger than everything it cuts
  2. 2. Any rock or fragment that's included inside of another rock is older than the rock in which it is included
  3. 3. The amount of time it takes half a remaining isotope to decay to a daughter product
  4. 6. bones of creatures
  5. 7. a guess of the age of a rock