| A | B |
|---|
| Geologic Time | The time scale of the history of the earth |
| Weathering | Particles of rock are broken down into smaller particles |
| Erosion | Smaller particles of rock are carried away by wind, waves, flowing water |
| Sediment | The name for particles of rock carried away by erosion |
| Deposition | The buildup of eroded rock particles or sediment |
| Sedimentary rock | Rock that forms from sediment because pressusre compacts the particles and minerals cement them together |
| Uplift | Any of a number of ways in which parts of the earth's crust are raised above others |
| Fossils | Traces of past life |
| Relative age (of sedimentary rock) | Lower layers of sedimentary rock were laid down first, so their relative age is older than higher layers |
| Absolute age | The approximate age of rock IN YEARS |
| Unconformity | A break in the layering of rock |
| Eras | Large divisions of geologic time |
| Precambrian Era | The first and longest era in Earth's history |
| Periods and Epochs | Smaller divisions of geologic time |
| Cenozoic Era | The geologic era that we are now in |
| Mesozoic Era | The era of the dinosaurs |
| Paleozoic Era | The era when plants and animals began to live on land |
