skipping stones!
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.
why are most of rocks extremely smooth
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.
Gastroliths were the smooth, rounded rocks that dinosaurs ingested to help them digest and grind their food. These rocks were swallowed and moved around in the stomach to break down tough plant material.
By weathering. The water currents weather the rocks leaving them smooth.
Rocks in a stream become smooth through a process called abrasion, where the sediments carried by the water wear down the rocks over time. This continuous rubbing and grinding against each other in the stream smoothens the surface of the rocks.
mica
some from weathering
cause rocks r dumb
Essentially, the only types of rock that can stand up to this type of erosion are igneous and metamorphic rocks. I am not certain there is a technical or scientific term for this type of rock, but the colloquial or "slang" term for them is river rocks.
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.