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Hadley cells are large-scale atmospheric circulation patterns that are characterized by rising and sinking air currents. They are named after the British meteorologist George Hadley, who first described them in the early 18th century. Hadley cells are found in the Earth's tropics and are responsible for many of the weather patterns that occur in these regions.Hadley cells are formed by the difference in heating between the equator and the poles. The equator receives the most solar radiation, which heats the air and causes it to rise. As the air rises, it cools and forms clouds, which can lead to heavy rainfall. This rising air then moves towards the poles, where it cools and sinks, leading to dry conditions.Hadley cells are typically found between latitudes of about 30 degrees north and 30 degrees south. Within these latitudes, the cells are responsible for several weather patterns, including the trade winds, monsoons, and the Inter-Tropical Convergence Zone (ITCZ). The trade winds, also known as the easterlies, are winds that blow from the east towards the west and are caused by the sinking air at the edges of the Hadley cells. Monsoons, on the other hand, are seasonal winds that bring heavy rainfall to regions such as India and Southeast Asia. The ITCZ is a band of low pressure that circles the Earth near the equator and is caused by the rising air at the center of the Hadley cells.Hadley cells play an important role in the Earth's climate and weather patterns. They help to distribute heat and moisture around the globe and are responsible for many of the weather patterns that occur in the tropics. However, the Hadley cells are also affected by climate change. The expansion of the Hadley cells is observed as a result of global warming, which causes the cells to move closer to the poles and can lead to more extreme weather patterns in some regions.In conclusion, Hadley cells are large-scale atmospheric circulation patterns that are found in the Earth's tropics. They are caused by the difference in heating between the equator and the poles and are responsible for many of the weather patterns that occur in these regions, including the trade winds, monsoons, and the Inter-Tropical Convergence Zone. Hadley cells play an important role in the Earth's climate and weather patterns, but they are also affected by climate change, which causes the cells to move closer to the poles and can lead to more extreme weather patterns in some regions.