Multiple choice

A considerable part of the harmful U.V. radition of the sun does not reach the surface of the earth because above earth’s atmosphere, there is a layer of

  1. CO2

  2. O3

  3. N2

  4. O2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A considerable part of the harmful U.V. radition of the sun does not reach the surface of the earth because above earth’s atmosphere, there is a layer of ozone.

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