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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.
So, colder air has less energy which means more molecules can fit into one space (because they are not bouncing off each other) which essentially makes it heavier. Read more: http://wiki.answers.com/Q/Why_doesn't_cold_air_rise#ixzz1A4ZINwNy.