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When eddies in a river whirl around sand and gravel, what do they cause? potholes stream piracy regolith removal headward erosion

User Lore
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A circular movement of water, counter to a main current, causing a small whirlpool. .
User Yehyatt
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It causes potholes. They mostly form when eddies whirl around pebbles causing them to spin.
User Michael Burdinov
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