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Atmospheric layers (ionosphere): The ionosphere contains ionised air which helps protect the Earth—mainly from which solar radiation? Consider which band is significantly absorbed by high-altitude ionised layers rather than by lower atmospheric layers. Choose the most appropriate option.

Difficulty: Easy

Correct Answer: The ultraviolet rays of the Sun

Explanation:

Given data

  • Ionosphere = ionised region at high altitude.


Concept/Approach
The ionosphere absorbs a significant portion of solar extreme ultraviolet (EUV) and X-ray radiation, protecting the lower atmosphere. (By contrast, most incoming meteoroids ablate primarily in the mesosphere; IR is not chiefly attenuated by the ionosphere.)


Final Answer
The ultraviolet rays of the Sun

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