Class 7 Exam > Class 7 Videos > Social Studies (SST) Class 7 > Composition of the Atmosphere
Composition of the Atmosphere Video Lecture | Social Studies (SST) Class 7
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FAQs on Composition of the Atmosphere Video Lecture - Social Studies (SST) Class 7
| 1. What are the main components of the Earth's atmosphere? |  |
Ans. The Earth's atmosphere is primarily composed of nitrogen (78%), oxygen (21%), argon (0.93%), carbon dioxide (0.04%), and trace amounts of other gases such as neon, helium, methane, krypton, and hydrogen.
| 2. How does the composition of the atmosphere affect climate change? | |
Ans. The composition of the atmosphere, particularly the levels of greenhouse gases like carbon dioxide and methane, plays a crucial role in climate change. Increased concentrations of these gases enhance the greenhouse effect, leading to global warming and resulting climatic changes.
| 3. Why is oxygen important in the atmosphere? | |
Ans. Oxygen is essential for the survival of most living organisms on Earth. It is required for respiration, a process in which organisms convert food into energy. Additionally, oxygen helps in the formation of ozone in the stratosphere, which protects life on Earth from harmful ultraviolet radiation.
| 4. What role does carbon dioxide play in the atmosphere? | |
Ans. Carbon dioxide (CO2) is a vital greenhouse gas that helps regulate the Earth's temperature by trapping heat in the atmosphere. It is also a key component of the carbon cycle, where it is absorbed by plants during photosynthesis and returned to the atmosphere through respiration and decay.
| 5. How do human activities affect the composition of the atmosphere? | |
Ans. Human activities, such as burning fossil fuels, deforestation, and industrial processes, significantly alter the composition of the atmosphere by increasing the concentration of greenhouse gases like carbon dioxide and methane. This leads to air pollution and contributes to climate change and global warming.
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Nov 21, 2024 Last updated |
Video Description: Composition of the Atmosphere for Class 7 2024 is part of Social Studies (SST) Class 7 preparation.
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