By weathering which is the gradual wearing away of something. In this case rocks can be weathered by water (current in a large water source or heavy rains) and even wind and other things such as acid rain. Hope that clears things up!
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Rocks become smooth through a process called abrasion, where they are rubbed against other materials such as sand, water, or ice. Over time, the friction from this rubbing wears down the rough edges and surfaces of the rock, resulting in a smooth texture.
When most people think of weathering, they may think of jagged rocks, shaped into that position by waves smashing at its side. There is also smooth weathering. Occasionally you'll find a rock that is completely smooth, which is pretty cool. But how do rocks get weathered smoothly?
A lot of the time when you find a smooth rock, it is because humans have made it smooth so nobody will be hurt by it, but naturally smooth rocks are weathered by wind. Without sand and small rock particles, and etc. the wind does mostly nothing, but with rock particles it can make a huge effect. If you ever see desert formations, they are mostly smooth because of the constant weathering put upon it by the sand and wind teaming up.
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Weathering causes rocks to be smooth because it causes the rocks to break down and get 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.
Rocks in a stream become smooth due to the constant force of flowing water wearing down their rough edges over time. The friction and impact from water flow results in abrasion, breaking off small particles and gradually shaping the rocks into a smoother surface.
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.
Rocks become smooth and rounded through a process called abrasion. This occurs when the rocks are continuously rubbed against each other or against other surfaces, wearing down their rough edges and surfaces over time. Factors such as water flow, wind, ice, and sand can contribute to this process.
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.