Geologic Time

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Across
  1. 2. The period when the first flowering plants appear.
  2. 6. The smallest unit of geologic time.
  3. 8. One massive supercontinent that formed about 300 million years ago.
  4. 9. The era that is known as the age of mammals.
  5. 11. The oldest period of the Paleozoic era.
  6. 12. An event that causes an enormous amount of species to die at the same time.
  7. 13. The oldest period in the Mesozoic era.
Down
  1. 1. A unit of geologic time that is longer than an epoch but shorter than an era.
  2. 3. A method that can be used to determine the absolute age of a rock.
  3. 4. The period when the first amphibians appear.
  4. 5. The time division that makes up about 88% of Earth's history.
  5. 7. The science that is related with the Earth's origin, structure, composition, and history.
  6. 10. The oldest era.