Across
- 5. rocks made of loose, eroded particles that harden together over time
- 6. a fossil on the planet from 410 mya to the present
- 8. the naturally preserved remains or impressions of organisms that live on the land long ago
- 11. the study of strata to determine the history of land
- 14. broken down pieces of rock
- 16. things in the past
Down
- 1. another way of measuring something
- 2. layers of rock
- 3. a layer of rock is younger than the layer under it and older than the layer above it
- 4. sections of rock, sand, and soil
- 7. crab fossil that lived 200-300 million years ago
- 9. a scientist who studies the history of life on Earth through the fossil record
- 10. type of fossil used to determine age
- 12. type of fossil that lived a million years ago
- 13. example of sediment
- 15. a scientist who studies geology