Across
- 2. time it take to make an isotope into an daughter's isotope
- 5. unstable isotopes process
- 7. leaves a gap in the the geologic record
- 9. same element different amount of neutrons
- 12. the age of an object since it was made
- 13. burrowing underground
Down
- 1. slabs that rest on plastic molded stuff
- 3. boundaries that dont blend well
- 4. based on radio metric dating
- 6. magma turns to rock
- 8. land slide,rockslides,and rockfall caused by gravity
- 10. bits of sediment strike other rocks.
- 11. thin layers of rock sedimentary