most rivers are naturally made and the can go for miles or just a few hundred yards and they can have a fast current or slow current,fast currents can carry very heavy objects including people and animals it may also carry heavy rocks and can carry them for ages.
slow currents can only carry things like fish and cans it may also carry small stones for a short distance of time. rivers are formed when it rains and the rain travels on the ground or in the dirt creating a pasage for water to flow down and then it carrys on traveling and if it reaches the sea then the river has reached its destination and can't carry on any further.
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