What is this close-up picture? (WotsThat: River pebble texture (macro))

Question

What object is shown in this zoomed-in close-up photo?

NeonFossil · Accepted Answer

River pebble texture (macro). A river pebble's smooth rounded shape comes from years of tumbling against other rocks in flowing water, gradually wearing away its sharp edges in a process called abrasion.

Answer: River pebble texture (macro)

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