There are many natural processes that are able to sort sediment according to size. Most of them are controlled by local water flow. Imagine a mountain stream; it moves fast (and is helped along in moving large cobbles by gravity), so you see a stream bottom made of large rocks and very little sediment 🙌 Downstream, where the slope is less and flow slower, the stream bottom can be sandy, or even silty 🙈 When large rivers overflow their banks and debouch onto broad, flat floodplains, the water suddenly slows down. The water can’t transport boulders, or much sand away from the channel. Instead, the stream bottom is made of mud. This mud has, according to the Wentworth diagrams, a grain size below 3.9 micrometers. This is what happens when a mountain streams exits into a valley on an alluvial plateau. It is the large stuff that gets dumped near the mountains, while finer sediment is carried away. It’s a very common progression in alluvial fans deposits. The sediment is coarser near the valley walls and gradually finer as it moves down the fan. 
Fine rock particles make up sand. Sand is a naturally occurring, finely divided rock, comprising particles or granules ranging in size from 0.0625 (or 1⁄16) to 2 millimeters. Sand grains are a small, individual particles in the same size range. Silt is the next smaller class of geology: silt particles that are below 0.0625mm and under 0.004mm. This is the next largest size class above sand is gravel, with particles ranging from 2 mm up to 64 mm (see grain size for standards in use). When rubbed between your fingers, sand feels rough (silt is like flour). There are 5 subcategories of sand. They can be divided by size. These sizes are based on the Φ sediment size scale, where size in Φ = -log base 2 of size in mm. On this scale sand is from Φ = -1 to 4, with the divisions between sub-categories at whole numbers. Harpreet Brooks, Amsterdam, Netherlands (adopted May 22, 2020). 
Cassondra Howard at geog.ucl.ac.ukThe following describes the process of measuring the amount of each type of mineral particle in soil. This is known as either mechanical analysis of soil (or particle size analysis). To determine the percentage of smaller and bigger particles, soil analysis involves first disaggregating the soil by grinding it. Then it is passed through a 2-mm sieve. It is then weighed, and its percentage. calculated as a percentage The whole soil sample. Sieving is another way to determine the proportions of coarse, medium, and fine sand. This allows them to be separated from clay and silt. They cannot be separated using sieving. They are instead separated using a process called sedimentation. This is due to the fact that smaller particles sink faster through water than larger ones. Therefore, when a suspension is composed of silt and clay in water, the silt settles faster than the clay. By measuring how fast the suspension overall settles it can be determined the distribution of particle sizes. Ceirra Rosado was kind enough to share their knowledge. 
It is crucial to identify which soil laboratory is using for particle-size classification (Table 2). Follow the instructions if it’s the US Department of Agriculture (USDA), which uses silt from 0.05 to 0.002mm. If the laboratory is using an international silt system (0.02 to 0.002mm), you will need to request a quantitative measurement of silt particles of 0.02 to 0.02mm diameter. These will enable you to alter the laboratory’s results, adjust them to conform with the USDA system, or use the Textural Triangle method. 
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