Geological Time Scal

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Across
  1. 2. First Eon
  2. 8. The assumption that rocks located under other rock are older than the rocks above it
  3. 9. Any feature that cuts another rock feature is younger than anything it cuts
  4. 10. Amount of time it takes half an isotope to decay
Down
  1. 1. The exact age of an rock
  2. 3. The remains of a plant or animal solidified into a rock
  3. 4. The age of a rock compared to another
  4. 5. Any rock fragments located inside another rock is older than the rock it is apart of
  5. 6. Layers of rock
  6. 7. Fossils that are useful for dating strata from the layer from which it is found