Well, much of the world's sand is made out of the same stuff, tiny crystals of the mineral quartz, which is made out of silica and oxygen, the two most common elements in Earth's crust. ... Quartz crystals form within a cooling glob of molten granite rock, or magma, deep under the Earth's surface.
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Well, much of the world's sand is made out of the same stuff, tiny crystals of the mineral quartz, which is made out of silica and oxygen, the two most common elements in Earth's crust. ... Quartz crystals form within a cooling glob of molten granite rock, or magma, deep under the Earth's surface.
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