Which statement accurately describes the Earth's atmosphere?a)The atmo...
The Earth's atmosphere is a layer of gas that surrounds the planet, extending to an approximate height of 600 kilometers. This gaseous envelope plays a vital role in supporting life on Earth by providing the necessary gases for respiration, regulating temperature, and protecting against harmful radiation from the Sun. The atmosphere consists of a mixture of gases, with nitrogen and oxygen being the most abundant, along with traces of other gases such as carbon dioxide, argon, and water vapor.
Which statement accurately describes the Earth's atmosphere?a)The atmo...
The Earth's Atmosphere: An Overview
The Earth's atmosphere is a critical component of our planet, providing essential conditions for life. Here’s a detailed explanation of why option 'C' is the correct answer.
What is the Atmosphere?
- The atmosphere is a layer of gases that surrounds the Earth.
- It is held in place by the Earth's gravity, preventing the gases from escaping into space.
Composition of the Atmosphere
- The atmosphere consists of a mixture of gases, including nitrogen (about 78%), oxygen (about 21%), and trace amounts of other gases such as carbon dioxide, argon, and water vapor.
- This diverse composition is crucial for various processes, including respiration in living organisms and the greenhouse effect that helps regulate the Earth's temperature.
Characteristics of the Atmosphere
- The atmosphere is not stationary; it is dynamic, with air currents, weather patterns, and temperature variations.
- It does not extend infinitely into space; it gradually thins out and transitions into the vacuum of space at high altitudes.
Importance of the Atmosphere
- The atmosphere protects life on Earth by filtering harmful solar radiation and maintaining a stable climate.
- It plays a vital role in the water cycle and weather systems, influencing ecosystems and human activities.
In summary, option 'C' accurately describes the Earth's atmosphere as a layer of gas surrounding the Earth, essential for supporting life and various environmental processes.
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