Across
- 2. finding the exact age is what type of age dating?
- 3. states that the bottom layer is the oldest and the newest layer is the youngest.
- 8. the remains of a prehistoric organism preserved in rock
- 9. relating to the study of the earth's physical structure and substance.
- 10. the time something has been on this planet
Down
- 1. states that anything cutting through a rock is younger than the layer(s) it cuts through
- 4. using a sequence of layers to find the age is what type of age dating?
- 5. states that anything inside of the rock is older than its surroundings
- 6. what type of rock has layers deposited over time?
- 7. the rate of decay is called the ___ of the isotope.