Because they have high availability across multiple regions.
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I think they call that rain.
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Same reason they produce lightning - static electric charge build-up
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I literally fell through a cloud once skydiving. They’re actually made of ice... or at least the one that I hit was. Felt like needles on my face.
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1.Surface area vs volume of droplets makes aerodynamics effects much larger than gravity for small objects 2.Static electricity/electric force 3.Thermal currents swirling them back up 4.Some are transitioning back and forth between liquid and gas 5.???
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Pretty sure temperature and pressure also come into it somehow by driving the droplets to either dissolve/evaporate into the air or condense and fall, so the pressure and temperature gradients are probably contributing to recirculating the droplets that sink
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They're probably hollow, like bird bones.
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If that is the case, how do birds get down?!
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Well how do they get up there to begin with...
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