Please rephrase - the question is unclear.
the Mississippi and Missouri rivers combined!!! :)
The Mississippi and the Missouri are two large US rivers.
Rivers are still called rivers in Australia. Smaller rivers and streams, however, are called creeks.Some of Australia's rivers are:Murray RiverMurrumbidgee RiverDarling RiverLachlan RiverCooper CreekFlinders RiverDiamantina RiverWarrego RiverGascoyne RiverBurdekin River
Potamology - the study of rivers Potamologist - the specialists who studies rivers A link can be found below.
Mississippi and the Missouri rivers.
Some states in the United States have few natural lakes, so they have dammed rivers to create artificial lakes called: RESERVIONS
the Mississippi River and the Missouri River are two major rivers in the US ha
how the rivers useful to us
They run south to north.
The Mississippi and Missouri rivers.
I am assuming you mean the rivers and rivulets that flow int a bigger river and contribute to its flow. In that case they are called tributaries. If you mean what are the rivers called when they flow into the sea, then they are called delta's or river mouths.
Small creeks, streams and rivers that flow into larger rivers are called tributaries