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The reason many rivers contain clay is because clay particles are lighter than the small rocks and pebbles beneath, so the clay particles are deposited on top of the rocks. However clay is not lighter than silt particles, in fact clay is much heavier. Normally the silt would cover the clay, but if the river is fast enough, it may continue to carry away the silt particles, and leave the clay.

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14y ago
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Q: Why is clay found in rivers?
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