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At least as far back as King David's psalms and Isaiah's prophecies, snow has been characterized as a symbol of purity. "Lawn [linen] as white as driven snow" was how Shakespeare once described it. Beyond the symbolism, the purity of snow has consequences for society. Snow is a key source of water for drinking and irrigation. It is also Earth's best method for reflecting sunlight back into space. [Source: NASA Earth Observatory]
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