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The first hole in ozone layer was detected in ?

A1980

B1985

C1990

DNone of the above

Answer:

B. 1985

Read Explanation:

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ഇനിപ്പറയുന്നവയിൽ ഏതാണ് മിനമാറ്റ രോഗത്തിന് കാരണമാകുന്നത്?