Chapter 6 Crossword Puzzle

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Across
  1. 2. The number of years that has passed since the rock has formed
  2. 5. A record of the geologic events and the evolution of life forms
  3. 7. A hollow area in sediment in the shape of an organism
  4. 8. The division of the time between Precambrian time and the Present into 3 long units of time
  5. 10. Magma that hardens beneath the earths crust forming igneous rock
  6. 11. A solid copy of the shape of an organism
  7. 14. A crack in the earths crust
  8. 15. The change of living things over time
Down
  1. 1. The time it takes for half of the radioactive atoms to decay in a radioactive element
  2. 3. When elements break down and release particles and energy
  3. 4. Eras that are subdivided into units of geologic time
  4. 6. Preserved remains of living things
  5. 9. The age of a rock compared to the ages of other rocks
  6. 12. Lava that hardens on the surface and forms igneous rock
  7. 13. No longer existing