Geologic Time Scale

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Across
  1. 5. Organisms that are found if animals that lived in a different time period
  2. 6. The solar system that was still forming within its accretion disc
  3. 7. Earths crust cooled, rocks and continental plates began to form
  4. 9. The Cretaceous Tertiary extinction
  5. 10. To use the age of organisms around the dinosaur to determine age
Down
  1. 1. Using fossils to determine the accurate age of the organism
  2. 2. The first known glaciation
  3. 3. The top layer is younger than the bottom layer
  4. 4. The mount of time it takes for half the atom to decay
  5. 8. The time of intense tectonic, climate, and evolutionary activity