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Making the world better, one answer at a time. Thin air is caused by low oxygen pressure at high altitudes. The lack of oxygen makes the air less dense. Thin air is caused by low oxygen pressure at high altitudes. The lack of oxygen makes the air less dense.
Clouds form whenever and wherever there is more water in a particular volume of the atmosphere than it can hold as vapor. The point at which air holds as much water vapor as it can without liquid water forming (condensation) is called the saturation point. When air cools, the amount of water vapor it can hold decreases. The most effective cooling process in the atmosphere is lifting. As air rises, its presssure decreases, thereby allowing it to expand and cool. With sufficient cooling, the air reaches saturation and small cloud droplets begin to form.