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As the water flow makes the rocks tumble against each other the high spots get chiped off. The tumbling and banging together with small grains of sand will smooth any rock over a long period of time. There must be enough water flow to keep the rocks moving for the process to work.
Wiki User
∙ 17y ago
Wiki User
∙ 13y agoround river stones have become shaped that way because they have been rolled around the river bed and eroded by sand and minerals rubbing over them for many years. the same effect can be accomplished by placing sharp edged rocks in a barrel with water and sand, then turning the barrel for a few days,
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