Geological time

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Across
  1. 3. The amount of time it takes for half of a remaining isotope to decay to a daughter product ​
  2. 4. Any rock or fragment that’s included inside of another rock is older than the rock which is included
  3. 8. Isotopes of some element decay at a known rate into daughter product
  4. 9. An undistributed sequence of rocks the oldest rock is on the bottom and the youngest rocks on top​
  5. 10. The exact age of something
Down
  1. 1. An undistributed sequence of rocks the oldest rock is on the bottom and the youngest rocks on top​
  2. 2. Any feature that cuts across a sequence of rocks is younger than every thing it cuts ​
  3. 5. Useful for dating and coregulating the strata
  4. 6. the remains of an animal after a long time
  5. 7. the age of a rock layer compared to other layers