People have long known that the world isn’t flat. Now, an innovative field survey of the world’s largest salt flat—a New Jersey–size playa high in the Andes—reveals that the barren expanse unexpectedly has minuscule variations in topography.
NOT FLAT AFTER ALL. A field survey of Bolivia’s Salar de Uyuni, the world’s largest salt flat, found a broad ridge (green area running southwest to northeast) flanked by shallow depressions (dark-blue areas).
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