Evaporation ponds are seen at the Intrepid Potash Mines near Carlsbad, New Mexico, USA. These mines produce muriate of potash and sulfate of potash magnesium, two mineral salts used in fertilizer. Salt is dried in these massive solar ponds after being pumped to the surface from underground brines. Water in the ponds is dyed with vibrant colors to reduce the time it takes for potash to crystallize — darker water absorbs more sunlight, causing it to evaporate more quickly.
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