Stream-deposited sediments are often well sorted because the size of particles moved is a function of stream velocity,quantity of water,and discharge.

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The size of particles that can be moved by a stream is related to the velocity of the water and its discharge. When a stream is carrying a lot of water and has a high velocity, it can move larger particles. As the stream slows down, smaller particles may be deposited. As a result, sediments deposited by a stream tend to be well sorted, with particles of similar sizes grouped together.

Stream-Deposited Sediments Are Often Well Sorted Because the Size of Particles