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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.
The high air pressure in these belts forces air to move toward a belt of low air pressure along the equator called the doldrums. The air converging at the doldrums rises high over the earth, recirculates poleward, and sinks back toward the earth's surface in the region of the horse latitudes, thus completing a cycle.The air does not move directly north or south because it is deflected by the rotation of the earth. See wind; Coriolis effect.he air converging at the doldrums rises high over the earth, recirculates poleward, and sinks back toward the earth's surface in the region of the horse latitudes, thus completing a cycle. The air does not move directly north or south because it is deflected by the rotation of the earth.