Geological Time

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Across
  1. 2. If there are any fragments inside a rock the fragments are older than the rock itself
  2. 3. The time taken for the radioactivity of a specified isotope to fall to half its original value.
  3. 6. The law that youngest components are at the top layers and oldest components are at the bottom layers
  4. 7. The approximate age determination of rocks, fossils or minerals made by comparing whether the material is younger or older than other surrounding material.
Down
  1. 1. The law that if a fault or a rock cuts or displaces another rock the rock it cut is the younger of the two
  2. 4. The exact or absolute age of fossils, rocks, or minerals
  3. 5. The remains of animals and plants who's bodies were buried