1. Vocab #14
Mr. Addeo

2. Absolute dating
describes the exact age of a rock as the number of years since it formed.

3. Relative dating
estimates the age of a rock by comparing it to the ages of other rocks.

4. Carbon dating
method used to date materials that were once living and exchanged carbon dioxide with the atmosphere.

5. Half-life
the time it takes for half of the radioactive atoms to decay in a radioactive element.

6. Radioactive dating
method used to date rocks and other objects based on the known decay rate of radioactive isotopes.