what name do we give to the cell of circulating air between about 30° and 60° or S of the equator ? ​

Ferrel Cell.

Explanation:

Ferrel cell is the circulating air that occurs between 30° and 60° or S of the equator. From 30° latitude to 60° latitude, a new cell is present which is known as the Ferrel Cell. This Ferrel cell produces prevailing westerly winds at the surface on these latitudes. Ferrel cell is a model for the wind circulation of mid-latitude segment of Earth which was proposed by William Ferrel in 1856.  

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the precambrian aged rocks could be found in australia. australia is a region that has a lot of ancient civilization history from million years ago. in this region, there are a lot of recognizable fossils buried in its land which is considered a precambrian-aged rocks