Across
- 5. Organisms that are found if animals that lived in a different time period
- 6. The solar system that was still forming within its accretion disc
- 7. Earths crust cooled, rocks and continental plates began to form
- 9. The Cretaceous Tertiary extinction
- 10. To use the age of organisms around the dinosaur to determine age
Down
- 1. Using fossils to determine the accurate age of the organism
- 2. The first known glaciation
- 3. The top layer is younger than the bottom layer
- 4. The mount of time it takes for half the atom to decay
- 8. The time of intense tectonic, climate, and evolutionary activity