Geologic Time Scale

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Across
  1. 2. The amount of time it takes for half an isotope to decay
  2. 4. law that states that a rock inside of another rock is younger than the rock it is inside of
  3. 6. Used to Calculate the aproximate age of something
  4. 9. The law that states that rocks towards the crust of Earth are younger than the rocks that are towards the core of Earth
Down
  1. 1. People who study the age of rocks
  2. 3. Used to calculate the exact age of soemthing using the decay of elements
  3. 4. When the same fossils are found in the same layer of rock across different regions of Earth
  4. 5. Remains of animals from a long time ago
  5. 7. A term for a ver long period in time
  6. 8. The law that states that the rock that cut through another chunk of rock is younger than the rock it cut through