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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.
Answers. 1  Warm, moist air colliding with cold, dry air. The resulting convection (where warm air tends to rise and cold air tends to sink) causes the warm, moist air to rise into the atmosphere. The upper atmosphere is cooler, so the moisture in the warm air condenses out as clouds.