The large deserts are all, about the same distance north and south of the equator., When the moist air over the equator is heated,, it rises., The warm, moist air moves, north towards the Sahara and south towards the Kalahari., As the air cools down, the water vapour condenses and, falls as heavy rain over the tropical rain forest of central Africa., Large masses of air sink, where the deserts are located., But now these air masses, are dry., Dry winds blow across, the deserts towards the equator., Because the wind that passes over the Sahara is dry,, there are no clouds or rain., The heat of the sun, beats down on the ground with nothing to block its rays.

trade winds

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