Moab Potash Ponds: The Intrepid Potash Mine in Moab, Utah, USA produces muriate of potash, a potassium-containing salt used widely by farmers in fertilizer. The salt is pumped to the surface from underground deposits and dried in massive solar ponds that vibrantly extend across the landscape. As the water evaporates over the course of 300 days, the salts crystallize out. The water is dyed bright blue to reduce the amount of time it takes for the potash to crystallise; darker water absorbs more sunlight and heat
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