Across
- 4. Succession the fossils tell the relative age
- 6. has a half-life of 4.5 billion years
- 9. tree-ring dating
- 11. the remains or traces of a dead plant or animal
- 12. a method of Absolute Dating
- 13. amount of time it takes for half of the unstable atoms to decay
- 15. sediment settles to the bottom of a body of water, becoming rock layers
Down
- 1. a vein of rock that cuts through a rock is younger than the rock
- 2. scientist who studies fossils
- 3. the rock formed around these, which are therefore older than the rock
- 5. oldest layer is on the bottom
- 7. using radioactive elements to give actual age
- 8. gives years in order they happened
- 10. study of rocks and rock formations
- 14. Continuity Grand Canyon, was cut by a river