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| Pregunta | Respuesta |
| river | it is useful as they drain the land of rainwater and carry it out to the sea |
| source | is the beginning or start of a river |
| course | the route the river take to the sea |
| confluence | the point at which 2 rivers join together |
| tribuatary | a stream or smaller river joining a larger stream or river |
| mouth | the point where a river comes to the end, usually when entering the sea |
| drainage basin | the area of land drained by a river |
| watershed | the edge of highland surrounding a drainage basin. it marks the boundary of the drainage basins |
| estuary | the part of a river mouth that is tidal |
| stages of a river | youthful/upper stage mature/middle stage old/lower stage |
| erosion | the river wears the landscape away |
| transportation | the river carries the material that is eroded |
| deposition | the river drops off the material it was carrying |
| hydraulic action | the force of the moving water wears away the banks and bed of the river |
| abrasion | small stones carried by the river wear away the banks and bed of the river |
| attrition | the small stones in the river are worn down and broken up as they hit of each other |
| solution | rocks, such as limestone, and soil are dissolved by acids in the water |
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