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The sand that makes up the dunes in White Sands National Monument are made of gypsum, an evaporite mineral left behind when bodies of water dry up. 白沙國家公園的白沙灘的沙丘是由石膏組成的，據(jù)悉，此類石膏是一種由水蒸發(fā)後畱下的鑛物。