Multiple choice

The ozone layer blocks the passage of

  1. photons

  2. cosmic rays

  3. electrons

  4. ultraviolet rays
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The ozone layer (O3) in the stratosphere absorbs and blocks most of the Sun's harmful ultraviolet (UV) radiation, particularly UV-B and some UV-C rays. This UV absorption is crucial for protecting living organisms from DNA damage and skin cancer. Photons, cosmic rays, and electrons are not specifically blocked by the ozone layer.

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