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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.
When a cold air mass pushes into hot air it forms something called a cold front. Since cold air is denser that hot air, the cold air mass acts as a wedge that lifts the hot aiâ¦r. If the warm air is unstable enough this lifting will lead to the formation of thunderstorms, which are powered by the warm air.