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en.wikipedia.org/wiki/River

A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake ... The water in a river is usually confined to a channel, made up of a stream .... river gradients) or in which a particular hard lithology causes a river to have a ... There are several systems of classification based on biotic conditions ...

www.americanrivers.org/rivers/discover-your-river/river-anatomy

Anatomy of A River. No matter how different our rivers are, however, all rivers share some basic anatomy features. American Rivers What parts make up a river ?

www.answers.com/Q/What_makes_up_an_river_system

tributaries, the main river, and the main body of water that it flows into.

www.cangeoeducation.ca/resources/learning_centre/classroom_activities/river_system.asp

This diagram shows some common characteristics of a river system. Every river is different, however, so not all rivers may look exactly like this illustration.

mypages.iit.edu/~smart/scanedw/River.htm

A river is different from a lake because water is moving down a river. ... clams, and insect larvae are some organisms that make up the first order consumers.

www.nationalgeographic.org/encyclopedia/river

Mar 14, 2011 ... Together, a river and its tributaries make up a river system. A river system is also called a drainage basin or watershed. A river's watershed ...

www.nhptv.org/natureworks/nwep7j.htm

As the water flows down, it may pick up more water from other small streams, ... Rivers and streams connect with each other in a system called a watershed. ... Although river water makes up only about 0.2 percent of all the fresh water on Earth, ...

www.tulane.edu/~sanelson/geol204/riversystems.htm

Oct 17, 2016 ... Up to 30% of the country has been covered with flood waters. In 1991 more 200,000 deaths resulted from flooding and associated tropical ...

www.ck12.org/book/CK-12-Earth-Science-Concepts-For-Middle-School/section/6.8

Features of streams and rivers. ... There is a lot of water from snow melt higher up . Sometimes water is ... A river and all its tributaries make up a river system.

www.sciencelearn.org.nz/resources/439-river-ecosystems

Mar 19, 2014 ... The ecology of the river refers to the relationships that living ... Oxygen is the most important chemical constituent of river systems – most organisms need it for survival. ... They are one of the species that make up whitebait.