The small ozone layer on top of the stratosphere is crucial for human survival. Why?

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Solution

The small ozone layer on the top of the stratosphere is crucial for human survival because it absorbs harmful ultraviolet radiations present in sunlight and prevents them from reaching the Earth’s surface.

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(a) Name the em waves which are used for the treatment of certain forms of cancer. Write their frequency range.
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(c) Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why?

(d) The small ozone layer on top of the stratosphere is crucial for human survival. Why?

(e) If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?

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