Across
- 1. rate of decay of isotopes
- 4. any rock layer that contains another rock, the rock that is being contained is the older rock
- 6. used to determine the age of rock strata when matching ones are found in different layers it means that they layers are similar in age
- 7. rock that cuts through a layer of rock is newer than the rocks it cuts through
- 9. how old one rock is compared to the age of another rock
- 10. the newer rock layers will be on top of older ones
Down
- 2. sometimes geologists use this to represent a specific period of time to help them find the age of rock layers
- 3. timeline for all of the events that have happened in Earth's history
- 5. radiocarbon dating
- 8. exact number of years old a rock is