Transcription of NCERT Book for Class 9 Geography Chapter 4
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NCERT Book for Class 9 Geography Chapter 4
In the last two chapters you have read aboutthe landforms and the drainage ofour country. These are the two of the threebasic elements that one learns about the naturalenvironment of any area. In this Chapter youwill learn about the third, that is, theatmospheric conditions that prevail over ourcountry. Why do we wear woollens in Decemberor why it is hot and uncomfortable in the monthof May, and why it rains in June - July? Theanswers to all these questions can be found outby studying about the climate of refers to the sum total of weatherconditions and variations over a large area fora long period of time (more than thirty years).Weather refers to the state of the atmosphereover an area at any point of time. The elementsof weather and climate are the same, , atmospheric pressure , wind ,humidity and precipitation.
The pressure and wind conditions over India are unique. During winter, there is a high-pressure area north of the Himalayas. Cold dry winds blow from this region to the low-pressure areas over the oceans to the south. In summer , a low-pr essur e area develops over interior Asia , as well as, over northwestern India. This causes a complete
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