Sand is made up of minerals and small rock particles that come from eroded rocks. It is typically comprised of quartz, which is a form of silica (silicon dioxide SiO2).
Sand is rocks and minerals, which have been ground down to small pieces due to weathering and erosion from wind, water, etc. The most common type is silica, which is what you can find in deserts and beaches, also in the form of quartz.
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