| A | B |
|---|
| erosion | removal and transport of surface material such as rock and soil |
| Condensation | occurs when water vapor cools and changes into liquid water droplets that form clouds |
| Precipitation | Rain, snow, sleet, or hail that falls from clouds onto the Earth |
| Runoff | Water that flows across land and collects in rivers, streams, and eventually, the ocean |
| Evaporation | Occurs when liquid water from Earth's surface and living organisms changes into water vapor |
| Infiltration | Movement of water into the ground due to the pull of gravity |
| Percolation | Downward movement of water through pores and other spaces in soil due to gravity |
| Water Cycle | Continuous movement of water from water sources, such as lakes or oceans, into the air, onto land, into the ground and back to water sources |
| Tributaries | Smaller streams or rivers that flow into larger ones |
| Drainage Basin | Also known as watershed. It's land drained by a river system |
| Divide | An area of higher ground than the basin it separates |
| Channel | The path that a stream follows |
| Gradient | The measure of the change in elevation over a certain distance |
| Discharge | The amount of water a stream or river carries in a given amount of time |
| Load | The materials carried in a stream's water |
| Youthful River | Erodes its channels deeper than wider and flows quickly due to a steep gradient |
| Mature River | erodes its channel wider than deeper and has a less steep gradient than youthful river. This type of river has good drainage |
| Old River | Has low gradient and low erosive power. These rivers have wide, flat flood plains or valleys and more meanders |
| Rejuvenated River | River that occurs where land is raised by the Earth's tectonic forces. Has steplike terraces |
