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Composition of the Atmosphere Video Lecture | Geography for Class 7

FAQs on Composition of the Atmosphere Video Lecture - Geography for Class 7

1. What are the main components of the atmosphere?

Ans. The atmosphere is mainly composed of nitrogen (about 78%), oxygen (about 21%), and trace gases like carbon dioxide, argon, and water vapor. These components are essential for life on Earth.

2. Why is oxygen important for living organisms?

Ans. Oxygen is crucial for living organisms because it is necessary for respiration. Animals and humans breathe in oxygen to produce energy, while plants use it during the process of photosynthesis to create food.

3. How does air pressure change with altitude?

Ans. Air pressure decreases as altitude increases. This is because the weight of the air above decreases, leading to lower pressure at higher elevations. For example, at sea level, air pressure is higher than at the top of a mountain.

4. What role does carbon dioxide play in the atmosphere?

Ans. Carbon dioxide is a greenhouse gas that helps trap heat in the atmosphere, keeping the Earth warm enough to support life. It is also essential for plants during photosynthesis, where they use carbon dioxide to produce oxygen and glucose.

5. How do human activities impact the composition of the atmosphere?

Ans. Human activities, such as burning fossil fuels and deforestation, increase the levels of greenhouse gases like carbon dioxide and methane in the atmosphere. This leads to climate change and can disrupt the natural balance of the atmosphere, affecting weather patterns and ecosystems.

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Sep 22, 2025 Last updated

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	Geography for Class 7 27 videos\|41 docs\|16 tests

Geography for Class 7

27 videos|41 docs|16 tests

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