| Term | Definition |
| Abrasion | A scouring action (scratching) |
| Cenozoic | Recent Life |
| Chemical Weathering | damage or change in materials caused by exposure to chemicals |
| Correlating Fossils | Fossils that match from one layer to another |
| Cross Section | The view of a section of land with a part cut away |
| Delta | Triangular deposit formed at the mouth of a river |
| Erosion | the movement of rock particles due to gravity and/or another agent |
| Fossil | Remains or evidence of previously existing life |
| Fossil Record | The arrangement of fossils in the order they existed |
| Geologic Time Scale | The arrangement of layers in the order they existed |
| Glacier | large moving mass of ice (they tend to carry large rocks which scrape the earth) |
| Index Fossils | Fossils specific to a certain time period, occurring multiple times in many places |
| Law of Superposition | The layer of rock on the bottom of the pile is oldest (there are exceptions) |
| Map view | birds eye view |
| Meander | Wide curves in the channel of a (older) river |
| Mesozoic | Middle Life |