Across
- 2. The time when dinosaurs started appearing.
- 6. The time when flowers started appearing.
- 7. When a crack or fault fills in the rock, the thing that fills it back up.
- 10. The time when birds started appearing.
- 11. Rocks or fragments of rocks found in one rock.
Down
- 1. The process where the rock layer at the bottom is older and the rock layer on the top is newer.
- 3. Finding what era a type of fossil is from.
- 4. The time when mammals started appearing.
- 5. Finding what exact year(s) a fossil is from.
- 8. the amount of time it takes for a remaining isotope to decay to a daughters product.
- 9. The remains of once living organisms.