During some sand avalanches, desert dunes vibrate like musical instruments, creating a massive noise. Scientists call this phenomenon “singing sand.” Most often the notes “played” by the dunes are G, E, or F.

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How Do Deserts Form?

The standard many college textbooks use to define a desert is: an area receiving less than 10 inches (250 mm) of precipitation per year. But why do these areas get so little precipitation in the first place? Geographically speaking, most deserts are found on the western sides of continents or—in