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1. • Erosion and weathering

     

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     • River rocks tend to be smooth and round because of a combination of the geologic processes of erosion and weathering. Rocks are eroded from surrounding areas and are initially rough and jagged, but over many years they are weathered via transport-induced abrasion to become smooth and rounded.
     communityliteracy.org/why-are-rocks-in-a-river-smooth/

     Why Are Rocks In A River Smooth? - CLJ

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   Why are river rocks smooth and round?

   • River rocks tend to be smooth and round because of a combination of the geologic processes of erosion and weathering. Rocks are eroded from surrounding areas and are initially rough and jagged, but over many years they are weathered via transport-induced abrasion to become smooth and rounded.

   Why River Rocks are Smooth: The Science, Explained

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   How does a rock get a smooth surface?

   • Over many years, these near-constant forces are enough to make the surface of a rock almost completely smooth to the touch. As rocks are being broken down in the running water, the little fragments of rock enter the river as sediment.

   Why River Rocks are Smooth: The Science, Explained

   rockhoundresource.com/why-river-rocks-are-smooth-the-science-explained/

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   Why do rocks get smaller downriver?

   • Even after they are well-rounded and smooth, the rocks remain subject to the abrasive weathering that made them that way. Rocks get smaller downstream because as they have had more time to be subjected to the weathering process. As the rocks are transported downriver they are worn down, gradually reducing in size.

   Why River Rocks are Smooth: The Science, Explained

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   What causes a rock to round and smooth?

   • During this time the rock is being rolled around as it moves, banging against other rocks and suffering damage with each impact. The impact between the rock and other rocks or the riverbed is the dominant force contributing to its rounding and smoothing.

   Why River Rocks are Smooth: The Science, Explained

   rockhoundresource.com/why-river-rocks-are-smooth-the-science-explained/

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   Why is a rock rounded?

   • The impact between the rock and other rocks or the riverbed is the dominant force contributing to its rounding and smoothing. Little bits of the rock break off or are scratched off with every impact, and overall that breaking and chipping add up to a rounded shape.

   Why River Rocks are Smooth: The Science, Explained

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   What causes rock shapes and sizes?

   • Rock shapes and sizes are due to a process known as erosion. Erosion is the geological process by which sediment, including rocks and boulders, are transported and worn down by nature. The major driving forces of erosion are wind, water, ice, and gravity.

   Why Are River Rocks Smooth? (A Complete and Scientific Explanation)

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3. rockhoundresource.com › why-river-rocks-are-smoothWhy River Rocks are Smooth: The Science, Explained

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   River rocks tend to be smooth and round because of a combination of the geologic processes of erosion and weathering. Rocks are eroded from surrounding areas and are initially rough and jagged, but over many years they are weathered via transport-induced abrasion to become smooth and rounded.

4. rockseeker.com › why-are-river-rocks-smoothWhy Are River Rocks Smooth? (A Complete and Scientific ...

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   Apr 30, 2021 · Physical forces like wind, water, ice, and gravity move rocks and smash and bump them against each other. Just like a rock tumbler, the rocks lose their jagged edges and then abrasion rounds out all the points that stick out or protrude as they tumble down mountains and through rivers.

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6. www.ncbi.nlm.nih.gov › pmc › articlesHow River Rocks Round: Resolving the Shape-Size Paradox

   www.ncbi.nlm.nih.gov › pmc › articles

   Feb 12, 2014 · Transport of pebbles in a stream causes them to collide and rub against one another and the stream bed, and the resulting abrasion produces the familiar smooth and rounded shape of river rocks.

   • Author: Gabor Domokos, Douglas J. Jerolmack, Andras Á. Sipos, Ákos Török
   • DOI: 10.1371/journal.pone.0088657

   • Publish Year: 2014
   • Publication: PLoS One. 2014; 9(2): e88657.

7. crystalcheta.com › why-river-rocks-are-smooth-theWhy River Rocks are Smooth? - crystalcheta.com

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   Apr 12, 2024 · River rocks are smooth and round because natural forces initiate the abrasion process on the rocks that continue for years. The rocks are not round when they form. Only some types of igneous rocks have smooth surfaces because they cool rapidly from lava during the formation process.

8. Videos

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     Geology - Why Rocks Are Smoother Near Rivers.

     25 May 2017

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     Why are the river pebbles round | How Were Pebbles Formed?

     26 Apr 2021

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     A Whole Bunch of Reasons You Should Be Using River Rocks in Your Aquarium!

     27 Jul 2022

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9. scienceblog.com › 70368 › geophysicistGeophysicist, Mathematicians Describe How River Rocks Round

   scienceblog.com › 70368 › geophysicist

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   For centuries, geologists have recognized that the rocks that line riverbeds tend to be smaller and rounder further downstream. But these experts have not agreed on the reason these patterns exist. Abrasion causes rocks to grind down and become rounder as they are transported down the river.

10. www.researchgate.net › publication › 260214081_HowHow River Rocks Round: Resolving the Shape-Size Paradox

    www.researchgate.net › publication › 260214081_How

    Feb 12, 2014 · River-bed sediments display two universal downstream trends: fining, in which particle size decreases; and rounding, where pebble shapes evolve toward ellipsoids. Rounding is known to result from...

11. phys.org › news › 2014-02-geophysicist-teamsGeophysicist teams with mathematicians to describe how river ...

    phys.org › news › 2014-02-geophysicist-teams

    For centuries, geologists have recognized that the rocks that line riverbeds tend to be smaller and rounder further downstream. But these experts have not agreed on the reason these patterns...