| A | B |
|---|
| alluvial fan | fan-shaped deposit of sediments at the base of a slope on land |
| channel | path that a stream follows |
| condensation | process by which water vapor changes to liquid water |
| delta | fan-shaped deposit of sediments at the mouth of a stream |
| desalination | process of removing salt from ocean water |
| divide | elevated region that separates two watersheds |
| evapotranspiration | process by which water enters the atmosphere; evaporation and transpiratin combined |
| floodplain | part of the valley floor that may be covered with water during a flood |
| gradient | change in elevation over a distance |
| groundwater | water that soaks deep into soil and rock |
| headward erosion | lengthening and branching of a stream |
| headwater | beginning of a stream |
| meander | wide curve in a stream channel |
| natural levee | raised riverbank that results when a river deposits its load at the river's edges |
| oxbow lake | water remaining in an isolated meander in a flood plain |
| precipitation | process by which water falls from clouds to the earth as rain, snow, sleet, or hail |
| rejuvenated | describing a river with a gradient that has been made steeper by movement of the earth's crust |
| runoff | water that flows over the land into streams and rivers |
| saltation | movement of sand by short jumps, caused by wind or water |
| stream load | sediments carried by a stream |
| stream piracy | capture of a stream in one watershed by a stream in another wateshed |
| tributary | feeder stream that flows into a main steam |
| water budget | gains and losses of water from a region |
| water cycle | continuous movement of water from the air to the earth and back again |
| water gap | deep notch left where a steam erodes through a mountain as it is uplifted |
| watershed | land from which water runs off into a stream |
| wind gap | water-eroded notch in a mountain through which water no longer flows |
| The change of water vapor into liquid water is called | runoff. |
| Vegetation gives off water vapor into the atmosphere through a process called | condensation. |
| In a water budget, the income is precipitatin and the expense is | evapotranspiration and runoff. |
| The process that turns sea water into fresh water is | desalination. |
| The land areas from which water runs off into a stream are called its | tributaries. |
| Tributaries branch out and lengthen as a river system develops by | headward erosion. |
| The stram load that includes gravel and large rocks is the | suspended load. |
| When a young river deepens its channel faster than it can cut into its sides, the result is | a gradient. |
| A stream whose gradient has been increased by movements of the earth's crust is said to be | rejuvenated. |
| The triangular formation that occurs when a steram deposits its sediment at the base of a steep slope is called | a delta. |
| The part of a valley floor that may be covered during a flood becomes the | floodway. |
| One indirect method of flood control is | soil conservation. |
