Across
- 4. the first eon
- 6. Period with dinosaurs
- 7. whats states that bottom layer is the oldest and top layer is the youngest.
- 8. what is recognized to represent a period of time?
- 10. gives the actual age.
Down
- 1. states events during Earths history.
- 2. when the same fossils are found in the same layer.
- 3. whenFeatures like faults and dikes are newer than the rock they cut through
- 5. does not give sepcific age.
- 9. time it take for half of the isotope to decay to a daughter product.