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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.
gradual thinning of Earth âs ozone layer in the upper atmosphere caused by the release of chemical compounds from industry and other human activity that contain gaseous chlorine and bromine. The thin... ...acid, which is one of the components of acid rain.