Across
- 5. the approximate age of a specific rock layer
- 6. the available body of infomation that tends to prove or disprove something
- 7. an expert in or student of geology
- 10. a line that marks the limit of something
- 11. a period of one hundred years
- 12. a group of living organisms consisting of similar individuals capable of exchanging genes
Down
- 1. the weather conditions prevailing in an area
- 2. individuals that study and investigate the natural world
- 3. time the extensive interval of time occupied by the geologic history of Earth
- 4. a length or portion of time.
- 8. the third planet from the solar system
- 9. natural world around us