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| General wearing of a surface by constant scratching, due to the presence of foreign matter such as metallic particles grit, or dirt in the lubricant. It may also cause a break down of material (such as gears tooth's surfaces). Lack of lubrication may result in abrasion. |
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| A large, fan-shaped pile of sediment forming at the base of narrow canyons onto a flat plain at the foot of a mountain range |
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| The lowest level to which a stream can erode the channel through which it flows, generally equal to the prevailing global sea level |
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| Sediment or other material that slides, rolls, or bounces along a stream or channel bed of flowing water. |
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| The fan-shaped area at the mouth or lower end of a river, formed by eroded material that has been carried downstream and dropped in quantities larger than can be carried off by tides or currents. |
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| In hydrology, the discharge of a river is the volume of water transported by it in a certain amount of time |
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| In hydrologic terms, the high ground that forms the boundary of a watershed. A divide is also called a ridge |
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| land area where precipitation runs off into streams, rivers, lakes, and reservoirs. It is a land feature that can be identified by tracing a line along the highest elevations between two areas on a map |
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| flash flood: a sudden local flood of great volume and short duration |
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| A strip of relatively flat and normally dry land alongside a stream, river, or lake that is covered by water during a flood. |
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| deep ditch cut by running water (especially after a prolonged downpour) |
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| The process by which a stream channel lengthens up its slope as the flow of water increases |
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| High mounds of silt, which have deposited on the banks of a river during flooding and have frequently been increased by man to protect the floodplain |
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| are looping changes of direction of a stream. These may be somewhat sine-wave in form. Typically, over time, the meanders don't disappear |
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| Crescent-shaped lake formed when a meander from a stream is cut off to form a lake |
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| The point at which a surface stream sinks underground |
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| a homogeneous mixture of two or more substances; frequently (but not necessarily) a liquid solution; "he used a solution of peroxide and water |
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| The natural movement of groundwater from one river basin to another (sometimes distant) basin. |
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| a mixture in which fine particles are suspended in a fluid where they are supported by buoyancy |
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| An opening in a resistant ridge where a trunk river has cut through the ridge |
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