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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.
Why does warm air rise in the atmosphere? If cold air is denser than hot air, then why does the temperature decrease as the altitude rises? Why is the humidity low when the air is warm?