atmosphere acts as a protective blanket for the organisms to exist. it keeps the average temperature of the earth fairly steady during the day and even during the course of the whole year. in addition the ozone shield (high concentration of ozone about 18-50km above the surface of the earth) of the atmosphere absorbs most of the harmful UV radiations coming from the sun thereby protecting man and animals from their harmful effects.
Answer2: The atmosphere acts as a shield and a blanket. An outer layer of the atmosphere, the stratosphere, contains a form of oxygen called ozone, which absorbs 99 percent of incoming ultraviolet (UV) radiation. Thus, the ozone layer helps protect many form of life, including humans and plankton, from dangerous radiation. The amount of stratospheric ozone is not fixed but is directly proportional to the intensity of UV radiation, making the ozone layer a dynamic, efficient shield. The atmosphere also protects from a barrage of millions of meteoroids, ranging in size from tiny particles to boulders. Fortunately, the majority of these burn up in the atmosphere, becoming flashes of light called meteors.
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