The two main processes that smooth out rocks and the main landscaping tools in general – wind and water. Wind carries with it sand, and if we think about shop class we know how amazingly smooth a little sand – in the form of sand paper – can get things. Water on the other hand it a force in itself, granted it can be helped by other forces like the wind to a more powerful, driving, smoothing force; this most obviously happens in riverbeds and streams as the water beats them constantly until they are nice and smooth. Both of these forces continually pound rocks all over until they are smooth.
Rounding in rivers is not due so much to the beating action of water itself, but to the collisions moving water creates between the cobbles, pebbles, sand grains and everything else there.
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