December 12, 2025
Water is the most consumed natural resource in the world. The second is sand, a key ingredient of cement, concrete, and asphalt. Global supplies are dwindling and sand is being illegally harvested from beaches and dunes. Some experts estimate the sand black market is worth up to $350 billion—more than illegal logging, gold mining, and fishing combined.
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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
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