Sun ki Harmful rays se kaise bachen? Or jaaniye sunscreen ke raaz..!!

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Harmful ultraviolet rays coming from sun are absorbed by

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Sunscreens block harmful ultraviolet (UV) rays produced by the sun. Each sunscreen has a Sun Protection Factor (SPF) that tells you how many minutes you can stay in the sun before you receive one minute of burning UV rays. For example, if you apply sunscreen with SPF 15, you get 1 minute of UV rays for every 15 minutes you stay in the sun. A label on a sunscreen with SPF 30 claim that the sunscreen blocks about 97% of harmful UV rays. Assuming the SPF factor is accurate, is this claim true? Explain.

Answer the given question orally : Which harmful rays reach the earth from the sun?

The Ozone Day is observed every year on September 16 as on this day in 1987 the _______ was signed for launching efforts to arrest the depletion of the fragile ozone layer in the stratosphere that prevents the harmful ultra violet rays of the sun from reaching the earthh, Fill the correct word in blank.