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Rivers are part of the water cycle, the continuous processes by which water moves about Earth. [3] This means that all water that flows in rivers must ultimately come from precipitation. [3] The sides of rivers have land that is at a higher elevation than the river itself, and in these areas, water flows downhill into the river. [4]
River ecosystems are flowing waters that drain the landscape, and include the biotic (living) interactions amongst plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions of its many parts. [1] [2] River ecosystems are part of larger watershed networks or catchments, where smaller headwater streams ...
Walla Walla River, Washington, US (Little River River; Walla means "river" in Sahaptin, repeated to express the diminutive ("little river")) River Waveney (the "ey" part of the name means "river") Winterbourne Stream, East Sussex, UK — bourne meaning a stream that only flows in winter. River Wissey (the "ey" part of the name means "river")
When not listing river lengths, however, alternative definitions may be used. The Missouri River's source is named by some USGS and other federal and state agency sources, following Lewis and Clark's naming convention, as the confluence of the Madison and Jefferson rivers, rather than the source of its longest tributary (the Jefferson). [3]
Dendritic drainage: the Yarlung Tsangpo River, Tibet, seen from space: snow cover has melted in the valley system. In geomorphology, drainage systems, also known as river systems, are the patterns formed by the streams, rivers, and lakes in a particular drainage basin. They are governed by the topography of land, whether a particular region is ...
The runoff from the land flows into streams and rivers and discharges into the ocean, which completes the global cycle. [26] The water cycle is a key part of Earth's energy cycle through the evaporative cooling at the surface which provides latent heat to the atmosphere, as atmospheric systems play a primary role in moving heat upward. [26]
River mouth of the Júcar, Cullera. A river mouth is where a river flows into a larger body of water, such as another river, a lake/reservoir, a bay/gulf, a sea, or an ocean. [1] At the river mouth, sediments are often deposited due to the slowing of the current, reducing the carrying capacity of the water. [1]
Rapids cause water aeration of the stream or river, resulting in better water quality. [2] For a rapid to form, a necessary condition is the presence of a gradient, which refers to the river or stream's downward slope. When a river has a larger gradient, the water flows downhill faster. [3] Gradients are typically measured in feet per mile. [4]