Across
- 5. rule that states that any feature that cuts through rock, is younger than the rock
- 6. rule that states that if a rock is lower, its older
- 7. finding the age of a rock in comparison with another rock
Down
- 1. Remains of a plant or animal that are preserved in rock
- 2. a way to find the age of a rock by finding its rate of decay
- 3. Rule that states that if a rock is inside another rock, it is older
- 4. rate of decay for an isotope with half remainging