What are Jet streams and how do they affect the climate of India?

What are Jet streams and how do they affect the climate of India?
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Ans: Fast flowing and narrow air currents are called jet streams. The streams flow at high altitudes (about 12,000 feet) in the troposphere. The westerly jet streams are responsible for western cyclonic disturbances in the north and north­western parts of India. The subtropical westerly jet stream moves north of the Himalayas with the apparent movement of the sun. The tropical jet stream (an easterly jet stream) blows over the Indian Peninsula; approximately over 14° north during the summer months. These jet streams are amongst one of the major factors in determining the movement of monsoons winds towards India sub­continent.
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Ture or false streams lose velocity when they join larger streams?

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Ture or false streams lose velocity when they join larger streams?

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