Across
- 2. First Eon
- 8. The assumption that rocks located under other rock are older than the rocks above it
- 9. Any feature that cuts another rock feature is younger than anything it cuts
- 10. Amount of time it takes half an isotope to decay
Down
- 1. The exact age of an rock
- 3. The remains of a plant or animal solidified into a rock
- 4. The age of a rock compared to another
- 5. Any rock fragments located inside another rock is older than the rock it is apart of
- 6. Layers of rock
- 7. Fossils that are useful for dating strata from the layer from which it is found