4. Give one word for each of the following: a) A layer of gases surrounding the earth b) Harmful radiations coming from the sun c) Maintenance of oxygen concentration in the atmosphere d) A gas used by green plants to make their food e) A gas present in air, which cannot be used directly by animals
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The ozone layer is a natural layer of gas in the upper atmosphere that protects humans and other living things from harmful ultraviolet (UV) radiation from the sun
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