At Niagara Falls, water roars over the edge and hits the water and rocks below, smashing into tiny droplets. When the water temperature is warmer than the air, the droplets mix with the air and warm it. The mixture expands, and the plume rises like a hot-air balloon. As it rises, the plume sucks in even more misty air. The greater the temperature difference between the air and the water, the taller and bigger the plume will grow.
Frigid winters envelop the region, and air temperatures can plummet 30 degrees below zero, but the constant flow at the falls keeps the water from dipping below 32 degrees. Those temperature differences make more mist.
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