What is earth and atmosphere
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Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. This mixture of gases is commonly known as air. ... The atmosphere protects life on Earth by absorbing ultraviolet solar radiation and reducing temperature extremes between day and night.
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Earth's atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. Trace amounts of carbon dioxide, methane, water vapor, and neon are some of the other gases that make up the remaining 0.1 percent.
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