Across
- 2. Exact age
- 5. a break in time in an otherwise continuous rock record
- 8. Rate of decay
- 9. younger above the older rock
- 10. very old remains
Down
- 1. Camparing of time
- 3. a fossil of a footprint
- 4. a fracture or zone of fractures between two blocks of rock
- 6. a body of igneous
- 7. The study of land