| A | B |
|---|
| Renewable resources | wind and solar power for example |
| Non-renewable resources | Coal, petroleum and natural gas for example |
| Mineral reserves | Known amount of ore in the ground |
| Coal | Combustable rock composed mainly of carbon |
| Eons | Largest time units |
| Eras | Combine to form eons |
| Periods | Combine to form eras |
| Epochs | Combine to form periods |
| Radiometric dating | Used to determine absolute ages |
| Conformable | Deposition without interuption |
| Carbon-14 | Used to determine the age of previous living organisms |
| Mesozoic Era | Most noted for dinosaurs |
| Cenozoic Era | Humans evolved |
