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Atmosphare

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  1. Which of the following statement about Stratosphere is / are true
    1. Extends out to about 50 km (30 miles)
    2. The bottom of this layer is calm. Jet planes often fly in the lower Stratosphere to avoid bad weather in the Troposphere
    3. The upper part of the Stratosphere holds the high winds known as the jet streams. These blow horizontally at speeds up to 480 km / hour (300 miles / hour)
    4. All of the above
Correct Option: D

NA


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