2.) Explain the two atmospheric belts of thermal origin. 80 to 100 words
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Answer:
Pressure Belts of Earth
The distribution of pressure on earth is uneven. Usually pressure is inversely related to the temperature and pressure reduced with altitude. The major factors are earth’s rotation and ascent and descent of air to affect distribution of pressure.
Creation of the Pressure Belts
Due to high amount of insolation over the equator, the air ascends and this air rising in the equatorial region descends at around 30° north and south latitudes. This means that the air at the equatorial region is thrown away from the earth and air at the Polar Regions is pulled towards earth. This implies that there is a low pressure is on equator and there is a high pressure area on poles. This gives rise to two belts of high pressure on Polar Regions each and one belt of low pressure on equator. The air that descends at 30°N and 30°S also created two belts of high pressures in the subtropical regions of both the hemispheres. Further, the rotation of the earth pulls the air at Polar Regions causes a rarification of air pressure at sub-polar regions. This also produces two belts of low pressure around 60°N and S latitude. This means that there are 7 belts of pressure as shown in the below graphics.