Across
- 3. ancient land mass believed to have broken into modern continents
- 5. study of arrangement of sedimentary rock layers or strata
- 7. event in geologic history when many species of organisms die out over a short period of time
- 8. unit of geologic time lasting tens of millions of years
- 10. a scientist who studies Earth's crust as well as the processes and history that shaped it
- 11. remains, impression, track, or other evidence of ancient organism
- 12. rock formed when sediments are pressed and cemented together
Down
- 1. law stating undisturbed rock strata are deposited older to younger
- 2. organizing into groups based on similar characteristics
- 4. division of geologic time lasting several hundred million years
- 6. a scientist that studies fossil remains found on Earth's surface in order to study primitive life forms
- 9. largest division of of geologic time, lasting many hundreds of millions of years