1. Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen 0.97% argon and carbon dioxide 0.04% trace amounts of other gases, and water vapor. It keeps the climate on Earth moderate compared to other planets. Without the atmosphere there could be no life on Earth.
2. Atmosphere is essential for life on Earth as it supplies oxygen, water, CO2 and some nutrients to living organisms, and protects living organisms from temperature extremes and excessive UV radiation.
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1. Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen 0.97% argon and carbon dioxide 0.04% trace amounts of other gases, and water vapor. It keeps the climate on Earth moderate compared to other planets. Without the atmosphere there could be no life on Earth.
2. Atmosphere is essential for life on Earth as it supplies oxygen, water, CO2 and some nutrients to living organisms, and protects living organisms from temperature extremes and excessive UV radiation.
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