Science

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Across
  1. 5. record of geologic events and evolution of life forms shown in rocks
  2. 7. time where life increased in complexity and Pangaea formed
  3. 8. organism with 500 million years
  4. 9. a horizontal row of elements
  5. 11. covers about 88 percent of earth's history
  6. 12. major volcanic eruption period
Down
  1. 1. the preserved remains or traces of an organism that lived in the past
  2. 2. organism with 80 million years
  3. 3. time when is defined by the dominance of dinosaurs and Pangaea breaking apart
  4. 4. has an age between 2.5 million and 10,000 years
  5. 6. one of the Mesozoic era
  6. 10. geologists divide the time between the precambrian and the present into periods of time