A) prevents entry of ultra -violet rays
B) prevents entry of X-rays
C) maintains level of oxygen on Earth
D) prevents acid rain on Earth
Correct Answer: A
Solution :
The ozone layer refers to a region of Earth stratosphere that absorbs most of the Sun's ultraviolet (UV) radiation. Ultra Violet radiation is very harmful to all living things. UV radiation can be harmful to the skin and is the main cause of sunburn: excessive exposure can also cause cataracts, immune system suppression, and genetic damage, and skin cancer
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