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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.
The thin envelope of air that surrounds our planet is a mixture of gases, each with its own physical properties. The mixture is far from evenly divided. Two elements, nitrogen and oxygen, make up 99% of the volume of air.