Across
- 3. - cuts across a sequence of rocks
- 5. - What planet we live on
- 8. - Exact
- 9. - Old remains in a rock
- 10. - Remaining isotope to decay
Down
- 1. - Sequence of rocks, old to new
- 2. - What on a clock
- 4. - Rock inside another rock
- 6. - Around
- 7. - How old something is