Final answer:
Cobbles are the largest sediment that can be transported by a stream at 100 cm/s.
Explanation:
Cobbles are the largest sediment that can be transported by a stream moving at a velocity of 100 cm/s. At this velocity, cobbles and boulders will remain stationary on the stream bed, while smaller particles like silt, sand, pebbles, and medium gravel will be transported or deposited.
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