What is sand formed from?

Sand is rocks that do not disintegrate under the influence of weather. It is wind, rain, snow. They break up into small pieces, and then completely into dust, which is called sand. There are a lot of minerals in the sand, some sands consist almost only of quartz and calcium. The largest amount of sand is on the seashore. There the rocks are exposed to wind, salt water and sand is formed. As we know, there is also a lot of sand in the deserts. He gets there with the help of the wind. There is also an assumption that deserts are the seabed. But millennia ago, the sea was empty and a desert was formed. sand is very important for human life. They make glass, sandpaper, use it as a construction material, and form the basis of water filters.