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