Q25 of 287 Page 345

Ozone hole over Antarctica appears during

Very low winter temperatures in the Antarctic stratosphere leads to appearance of ozone hole over Antarctica due to formation of polar stratospheric clouds.

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23

Name the gas which plays a major role in global warming

 24

Green house effect is caused by

 1

Define soil erosion.

 2

Mention any three human activities which are responsible for depletion of the ozone layer.