The sand is an example of one of such materials. Therefore the natural grain. The sand caused by stones is as a pigment in detail, which means that in General, we found the sand on the beach. But, again, in terms of science. Particle size, the size of the name means "sand" that has a grain size between 0.0625 to sludge particles or granules 2 mm a particle of sand, it is called the "granules of sand particle size small" next to. The dough is called the sand particles that are smaller than 0.0625 mm 0.004 mm in size until the section of a larger particle size particle of sand. Called the gravel particles larger than 2 to 64 mm when using a finger gently rubbing the sand particle size, Barracuda. The flour particles, sand section feel like '' rubbing powder, but it feels a little sak)
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