Rock materials carried by wind in arid areas hit and rub against other desert rocks on the wind path
The materials also collide with each other
They break and reduce in size
They form rounded sand grains called "millet seed" sand grains and fine dust
This process is called attrition
isaacmuthini answered the question on October 12, 2017 at 05:24
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October 11, 2017
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October 5, 2017
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October 5, 2017
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October 5, 2017
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