Ascending air at the equator and descending air around 30°n and s latitudes create semicircular air circulation routes known as

The answer is Hadley Cells.

Aregion is an area of land that has common features. these features can be natural, such as climate or landscape. they can also be artificial, such as language or religion. the xinjiang uyghur autonomous region, above, is an area of china inhabited by uyghurs, a muslim group with ethnic ties to turkish people.