Geologic Time Scale

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Across
  1. 3. Different layers in Earth, the oldest are on the bottom and the youngest are on top
  2. 5. A large chunk of time in Earth's history
  3. 6. Any feature that cuts across a sequence of rocks, is younger than everything it cuts
  4. 10. Any rock or fragment inside of another rock is older than the rock in which it is included
Down
  1. 1. In an undisturbed sequence of rocks, the oldest rocks are on the bottom and the youngest rocks are on top
  2. 2. age an estimate age of something from the past
  3. 4. age dating When scientists find the exact age of something due to unstable isotopes
  4. 7. An organism that didn't decay and instead was incased in mud
  5. 8. Fossil A fossil that only exists for a short amount of time and can only be found in one rock layer
  6. 9. How long it takes to decay to a daughter product