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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.
Actually, cold air just sinks while hot air rises (due to density of the collection of particles)... this flowing is just the wind pushing particles around, so you'll sense a change in temperature...