| A | B |
|---|
| Ecology | Study of organisms and their environment |
| Environment | The area surrounding an organism including living and non-living things |
| Adaptations | Characteristics that help organisms survive in their environment |
| Organism | A living thing |
| Uniformitarianism | The Earth's processes have been going on for a very long time and are continuing today |
| Relative Dating | Determining the order things occured in |
| Law of Superposition | The youngest rocks are on top |
| Principle of Original Horizonality | Layers of sediment settled in flat, horizontal layers due to gravity |
| Principle of Cross-Cutting Relationships | Dikes, and faults are younger than the layers the cut across |
| Unconformity | A change in layers that represents a period of erosion before more deposition |
| Correlation | Matching layers in different areas |
| Fossil | The remains or imprint of an ancient organism |
| Index fossil | A fossil of an organism that exist for a short period of time over a wide area |
| Geologic Time Scale | 4.5 billion years ago to present |
| Eon, Era | Period, Epoch |
| Prokaryote | A simple single celled organism without a nucleus |
| Gondwana | The southern continent |
| Lurasia | North America, Europe and Asia, north of Gondwana |
| Gymnosperm | Cone bearing plants (pines) |
| Angiosperms | Flowering, Fruiting plants (apples) |
