some from weathering
why are most of rocks extremely smooth
By weathering. The water currents weather the rocks leaving them smooth.
Very smooth rocks are called "polished rocks" or "river rocks" due to the smooth texture achieved from erosion in water bodies like rivers and oceans.
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Smooth rocks on a beach are often the result of continuous erosion caused by water and sand rubbing against the rocks over time. The motion of waves can wear down the rough edges of the rocks, making them smooth.
They may be smooth and others may be rough. Smoothness/roughness is not a defining characteristic for igneous rocks.
Rocks in stream beds can become smooth due to a process called abrasion. As water flows over the rocks, it carries sediment and particles that constantly rub against the rocks, wearing them down and making them smooth over time. The friction caused by the movement of water and sediment helps polish the surface of the rocks.
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Rocks become smooth through the process of weathering, which includes abrasion from wind, water, or ice over time. Rocks that are not smooth may have experienced less weathering or may be composed of harder materials that resist erosion. The smoothness of a rock can also depend on its location, as rocks in a riverbed or along a coastline are more likely to become smooth.
River rocks, because have smooth edges.
clay, smooth rocks and mud