In each hemisphere, air circulates through the troposphere in three cells known as Hadley cells, Ferrel cells and Polar cells. At any one time there are multiple weather systems active around the globe with variable winds. When these winds are averaged over many years a well-defined global circulation pattern appears. The global circulation. Over the major parts of the Earth's surface there are large-scale wind circulations present. The global circulation can be described as the world-wide system of winds by which the necessary transport of heat from tropical to polar latitudes is accomplished. In each hemisphere there are three cells (Hadley cell, Ferrel cell and Polar cell) in which air circulates through the entire depth of the troposphere.
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This chapter describes the common types of network media, including twisted-pair cable, coaxial cable, ï¬ber-optic cable, and wireless. Twisted-Pair Cable Twisted-pair cable is a type of cabling that is used for telephone communications and most modern Ethernet networks. A pair of wires forms a circuit that can transmit data. The pairs are twisted to provide protection against crosstalk, the noise generated by adjacent pairs.