| A | B |
|---|
| Water Cycle | the continuous movement of water forom the atmosphere to the earth's surface and back to the atmosphere again. |
| evapotranspiration | the processes of evaporation and transpiration |
| runoff | when water flows over the land |
| groundwater | soaks deep into the soil and rock underground |
| condensation | When water vapor rises in the atmosphere, it expands and cools. |
| precipitation | the process by which water falls from clouds to the earth's surface as rain, snow, sleet, and hail. |
| water budget | the continuous cycle of evapotranspiration, condensation, and precipitation |
| desalination | the process of removing salt from ocean water |
| tributaries | feeder streams |
| watershed | drainage basin |
| divides | the ridges or elevated regions of high ground that separate watersheds are called divides. |
| channel | the path that follows a stream |
| headward erosion | carries away sediments from the slopes of a watershed at the upper end of a stream |
| steam piracy | the capture of a stream in one watershed by a stream with higher rate of erosion in another watershed |
| stream load | the materials carried by a stream |
| saltation | short jumps |
| gradient | sleepness of a slope |
| headwaters | begginning of a stream, the gradient is steep |
| water gap | a deep notch is formed where the stream has eroded its channel through the raised mountains |
| wind gap | the notch through which water no longer flows |
| meanders | wide curves |
| oxbow lake | when the river cuts through the neck, it deposits sediments at both ends of the meander and eventually abandons it. |
| rejuvenated river | is one whose gradient has become steeper in this way. |
| Delta | the fan-shaped deposit at the mouth of a stream |
| alluvial fan | a fan-shaped heap with its tip pointing upstream |
| floodplain | the part of the calley floor that may be covered with water duting a flood |
