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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.
Where does the hot and cold air that form a tornado come from? To start off, the warm air cold air are not the direct cause of tornadoes. When cold air plows into warm air, it forces the warm air up causing the moisture in it to condense â¦and form thunderstorms. Given a few other conditions these storms can produce tornadoes.