Give reasons as to why.
(i) Seasonal reversal of wind direction takes place over the Indian
subcontinent?
(ii) The bulk of rainfall in India is concentrated over a few months.
(iii) The Tamil Nadu coast receives winter rainfall.
(iv) The delta region of the eastern coast is frequently struck by cyclones.
(v) Parts of Rajasthan, Gujarat and the leeward side of the Western Ghats are
drought-prone.
Answers
Seasonal Reversal of wind direction take place over the Indian subcontinent because in winter there is a high pressure area in north of the Himalayas & there is a low pressure area over the ocean to the south. So cold and dry winds blow from the Himalayan region towards the ocean.
Answer:
(i) Seasonal Reversal of wind direction take place over the Indian subcontinent because in winter there is a high pressure area in north of the Himalayas & there is a low pressure area over the ocean to the south. So cold and dry winds blow from the Himalayan region towards the ocean.
(ii) The rainfall received by India is largely due to the south-west monsoon winds. The duration of the monsoon is between 100 to 120 days. Hence, the bulk of rainfall received by the country is concentrated over a few months.
(iii) Hence, Tamil Nadu receives most of its rain from north east and retreating monsoons during winter season. Moreover, many low pressure systems develop in the Bay of Bengal during this period and move towards the east coast of Tamil Nadu causing heavy rainfall.
(iv) The delta region of the eastern coast is frequently struck by cyclones because the cyclonic depressions which originate over the Andaman Sea generally cross the Eastern coasts of India and cause heavy and widespread rain, (a) These cyclones are often very destructive.
(v) Parts of Rajasthan, Gujarat and the leeward side of Western ghats are drought-prone because they receive scanty rainfall. The monsoon winds are left with very less moisture by the time they reach Rajasthan and Gujarat so these areas are drought prone.
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