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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.
When the wind blows moist air into an area, the air pressure in that area will drop in response to the change. This phenomenon is called moisture advection, and results from the fact that moist air has a lower density that dry air, and results in less pressure on the earth's surface.