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The Different Types of Sand
There must be different types of sand because if we're making glass, we're making concrete and we're making roads. Is this all the same stuff? There's got to be different stuff in there, right? If sand is just kind of a generic term for small bits of minerals, is that right? So sand, like you said, can be little grains of any hard material. That's why you get different colored sands on different beaches around the world.