1. Put these layers in order from oldest to youngest

3. Relative Dating: Determining whether an object is older or younger than other objects

4. Absolute Dating: Determining the age of an object by determining the number of years it has existed
Rocks and minerals have traces of radioactive elements, such as uranium

5. Those elements decay at a constant rate

6. When atoms decay, they go from parent to daughter atoms

7. By measuring the # of unstable atoms left in a rock and comparing it to the # of daughter atoms, we can estimate how much time has passed since the rock formed

10. Vocab
Late/Missing work
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