❓ why
Why do some lake shores have perfectly round stones while riverbeds have sharper rocks?
NatureLakes
Quick Answer
Waves and waves-driven movement at lake shores tumble stones repeatedly, wearing them smooth. Riverbeds often move rocks more intermittently, so many stay rougher and more angular.
The Full Story
In many lakes, waves wash pebbles back and forth across the shoreline again and again. This constant rolling and collision rounds the stones through abrasion. Riverbeds can also round stones, but in fast-moving sections rocks may be transported in bursts during floods rather than continuously. A pebble that spends time resting in a riverbed may not get polished as much. This is why beaches and some lake margins often look smoother than many river gravel bars.
Key Facts
1.Repeated abrasion rounds stones
2.Lake waves can move pebbles continuously
3.Flood-driven river transport is often less constant
YouTube Angle
Suggested video title for this topic:
"Why some pebbles get polished into marbles"