Formation of ozone hole is maximum over

Formation of ozone hole is maximum over Correct Answer Antarctica

Ozone holes are formed in Antarctica and these are due to special clouds that form in the stratosphere called polar stratospheric clouds. Clouds usually do not form in stratosphere, this can happen only at such low temperatures. These clouds accumulate pollutants resulting in formation of ozone holes.

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A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where $$\sigma $$ = Stress for a plate with no hole i.e. nominal stress)
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If it takes 50 workers 4 hours to dig a hole, how long should it take 30 workers to dig the same hole?
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