题目内容

Why are particles of similar size usually found together deposited by streams?

A. Particles of smaller size usually get deposited in the faster-moving parts of the stream, but the larger particles can be deposited in the slower parts.
B. Particles drop in order according to weight and settling velocity as a stream’s velocity drops, starting with the largest and ending with the smallest.
C. Particles drop in order according to size and shape as a stream’s velocity increases, starting with the smallest and ending with the largest.
D. Particles of larger size usually get deposited in the slower-moving parts of the stream, but the smaller particles can be deposited in faster-moving water.

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