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en.wikipedia.org/wiki/River

A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as stream, creek, brook, ... A river valley that was created from a U-shaped glaciated valley, can often ...

earthscience.stackexchange.com/questions/5253/how-do-long-rivers-exist

Jul 25, 2015 ... Lakes could be understood as temporary stop in the flow, and it will ... If the river ends in the ocean, the fact that it is long is just imposed by the ...

idahoptv.org/sciencetrek/topics/rivers/facts.cfm

Later we will learn about unique aspects of rivers, the cycle of water on the earth, and the rivers of Idaho. ... Often from melting snow high in a mountain range during the warming of spring. ... water on the route to the lowest point - which will usually be its final goal - the ocean. ... It might be another river, a lake, or an ocean.

water.usgs.gov/edu/watercyclestreamflow.html

Dec 15, 2016 ... Unless the river flows into a closed lake, a rare occurrence, or is ... flowing water bodies, in these pages we'll use "rivers" more often, ... Large rivers may take days to rise and fall, and flooding can last for a number of days.

www.nhptv.org/natureworks/nwep7j.htm

Water from some source like a spring, snow melt or a lake starts at this high point and begins to flow down ... Eventually all this water from rivers and streams will run into the ocean or an inland body of water like a lake. ... Soil is deposited last.

www.nature.org/ourinitiatives/habitats/riverslakes/threatsimpacts

... our rivers and lakes. Within about 10 years most people on the planet will face life with water shortages. ... Too often we pit one need against another as we use rivers and lakes to meet our needs. We grow food in .... Latest News & Features.

www.nationalgeographic.org/encyclopedia/river

Mar 14, 2011 ... A river may be only kilometers long, or it may span much of a continent. ... Also, the length of rivers can change as they meander, are dammed, or their deltas ... Where the river meets the ocean or a lake, it may deposit so much ..... last of the prehistoric "three ages," following the Stone Age and the Bronze ...

www.nationalgeographic.com/environment/freshwater/rivers

Learn about freshwater rivers and their impact on the environment. ... tributaries are the veins of the planet, pumping freshwater to wetlands and lakes and out to sea. .... Latest Stories ... Small artisans often can't compete with globalization.

www.mnn.com/earth-matters/wilderness-resources/stories/how-long-does-water-molecule-stay-oceans-lakes-rivers

Apr 8, 2016 ... A water molecule's "residence time" in a given system can help us ... In rivers, a water molecule won't dawdle as long — just a couple weeks to several .... been prohibitively expensive until the last decade or so, McGuire says.