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ഓസോൺ പാളിയിലെ ആദ്യ വിള്ളൽ കണ്ടെത്തിയത് ഏത് വർഷമാണ്?

A1980

B1985

C1986

D1990

Answer:

B. 1985

Read Explanation:

ഓസോൺ പാളിയിലെ ആദ്യ വിള്ളൽ കണ്ടെത്തിയത് 1985ലാണ്.


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