What are jet streams?

High velocity winds that blow in the upper troposphere at an altitude of around 12,000 metres.

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High velocity winds that blow in the stratosphere at an altitude of around 12,000 metres.

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Low velocity winds that blow in the upper troposphere at an altitude of around 12,000 metres.

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Low velocity winds that blow in the stratosphere at an altitude of around 12,000 metres.

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Solution

The correct option is A High velocity winds that blow in the upper troposphere at an altitude of around 12,000 metres.
Jet Streams are high velocity winds that blow in the upper troposphere at an altitude of around 12,000 metres. These winds are faster than surface winds as there are no obstacles in the upper troposphere. The speed can vary from 110 to 184 km/h in winter.

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