Am sure we all know the water cycle, i.e. how water falls to the ground and then evaporates back to the sky, but after getting to the sky and forming a cloud how does that large amount of
water stay their?

 I don’t know about you but when I throw a cup of water toward the sky, the water comes falling back to the ground. Here is why clouds are able to float;
  •  in other for anything to float it needs to displace its own weight for example a boat will only float if the weight of water it displaces is equal to its own weight                                                       
  • The mass of clouds over a given area is relatively light when compared to the mass of air in that same area, so in a way they are able to displace their own weight
  • water vapor is less dense than dry air moist air will have a tendency to float above drier air (all else being equal). Clouds float on drier air just as bubbles float on water.
  •  The vast majority of clouds you see contain droplets or crystal of water that are very small.
    clouds do contain a lot of water, this water is spread out for miles in the form of tiny water droplets or crystals, which are so small that the effect of gravity on them is negligible
  •  Air movements have much more of an effect on moving cloud droplets as compared to gravity. This is because the larger the mass of an object, the bigger the amount of gravitational force acting on it. Compare dropping a basket ball and a feather at the same time; now compare dropping a feather with a dust particle at the same time. Of cause the basketball and the feather will drop faster in both cases respectively. 
  •  Clouds do not have a tendency to sink since they are less dense than the air below or around them. Clouds that do sink will eventually evaporate since the sinking process produces a warming of the air 
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