A lokacin da makamashi daga Sun warms wannan Layer, da kuma surface kasa, haddasa fadada na iska. Wannan ƙananan-yawa iska sa'an nan ya tashi da kuma an maye gurbinsu da mai sanyaya, mafi girma-yawa iska. A sakamakon shi ne yanayi zagayawa da ke tafiyar da yanayi da kuma sauyin yanayi ta hanyar redistribution na thermal makamashi. A farko yanayi zagayawa bands na hasken rana cinikayya a equatorial yankin kasa 30 ° latitude da kuma yammacin faduwa a tsakiyar-latitudes tsakanin 30 ° da kuma 60 °.
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