Across
- 2. The amount of time it takes for half an isotope to decay
- 4. law that states that a rock inside of another rock is younger than the rock it is inside of
- 6. Used to Calculate the aproximate age of something
- 9. The law that states that rocks towards the crust of Earth are younger than the rocks that are towards the core of Earth
Down
- 1. People who study the age of rocks
- 3. Used to calculate the exact age of soemthing using the decay of elements
- 4. When the same fossils are found in the same layer of rock across different regions of Earth
- 5. Remains of animals from a long time ago
- 7. A term for a ver long period in time
- 8. The law that states that the rock that cut through another chunk of rock is younger than the rock it cut through