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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.
A: Without the up and down motion of air within the atmosphere, we would have very little weather. Rising air is caused by several reasons: Heating from the Earth, areas of low pressure, the movement of fronts, as well as mountainous terrain can all cause air to rise.