Across
- 3. A fossil that is super abundant and is used to determine the age of rock strata.
- 4. A scientist who studies the Earth and rocks.
- 6. A scientist who studies fossilized remains of animals.
- 8. The method of using the law of superposition and index fossils to find the estimated age of rock layers.
- 9. The remains of an animal that has passed away.
- 10. A very long period of time.
Down
- 1. This law is used to determine the age of rock layers.
- 2. The way to find the exact age of a fossil or rock.
- 5. The current era that we are living in.
- 7. The word to describe how much a element has broken down to half of its original value.