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Which of following clast sizes would be most likely transported in very fast moving water? silt cobbles sand?

User Osnoz
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I would say that in very fast moving water such as in a river, the cobble size could be transported because cobbles are 64-256mm so are quite big and in a quiescent stream won't move much but in a freshet say in a steep mountain stream they can be rolled along such as I observed in the local streams at a mining town during the Hurricane Fifi in Honduras in 1974.
User Buqing
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