Q.

Ozone layer is formed due to reactions of :

A. oxygen and ultraviolet rays
B. carbon dioxide and layers of atmosphere
C. cosmic rays and layers of atmosphere
D. infrared rays and ultraviolet rays
Answer» A. oxygen and ultraviolet rays
Explanation: Ozone in the Earth's stratosphere is created by ultraviolet light striking ordinary oxygen molecules containing two oxygen atoms (O2), splitting them into individual oxygen atoms (atomic oxygen). The atomic oxygen then combines with unbroken O2 to create ozone (O3).
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