Across
- 4. preserve structure of matter
- 13. indefinitely long amount of time
- 14. deposition of one geological stratum
- 15. empty space in a body
- 16. remnants of prehistoric organisms
- 17. rocks are oldest to youngest
- 19. time for isotope to half
- 20. a slope in a rock
- 21. relative proportion of isotopes
- 22. a specialist in geology
- 26. division of time in Earth's history
- 27. gradual destruction of something
- 28. disintegration of radioactive items
- 29. bends in a rock
- 30. particle different from others around it
- 31. theory about a continuous process
- 32. specialist in fossils
Down
- 1. extended break in rock
- 2. contact between unconformable strata
- 3. sediment that cuts through others
- 5. core sample from ice sheet
- 6. long distinct period in history
- 7. period of time in history
- 8. length or portion of time
- 9. dying out of a group
- 10. the fossil of a footprint
- 11. determining computed age
- 12. weather conditions in an area
- 18. theory about sudden events
- 23. age compared to other rocks
- 24. fossil that is useful for dating
- 25. particles emitted in one second