The three stages in a river or stream's development are youthful, mature and old. Geologists classify streams along with rivers and view their development as a flowing body of water progressing along the same three stage... More »

Most rivers have an upper (youthful) course, a middle (mature) course and a lower (old age) course. These stages are marked by variations in the characteristics of the river. More »

Three Rivers Stadium was a stadium in Pittsburgh, Pennsylvania that opened on July 16, 1970 and was demolished on December 16, 2000. The stadium derived its name from its location at the confluence of the Allegheny River... More »

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The Minnesota Department of Natural Resources explains that there is no official distinction between streams and rivers, but streams are commonly held to be smaller bodies of water that feed into larger bodies, namely ri... More »

Tributaries are streams or rivers that flow into a larger main river. This much larger river also is referred to as a main stem. A tributary also is called an affluent. More »

Most rivers have an upper (youthful) course, a middle (mature) course and a lower (old age) course. These stages are marked by variations in the characteristics of the river. More »

According to About.com, mature rivers are bodies of water that flow over wider valleys and snake along flat plains. The meandering streams then create larger loops that develop into oxbow lakes. More »