The formation of river rocks requires moving water and smaller rocks. Rocks easily eroded by water more likely form river rocks. Typical rocks with jagged edges can fall into the bottom of a river or stream bed or remain on the river bank. The speed of the river determines how quickly the rock becomes a river rock.
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How old could the average rock be, how young? Are most very old? How old? How long does it take to make an average round rock? How does it happen? : r/askscience
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Why do river rocks get smooth and round over time? #nature