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Video: The Earth's atmosphere Video Lecture | IGCSE Cambridge Science for Year 7 - Class 7

FAQs on Video: The Earth's atmosphere Video Lecture - IGCSE Cambridge Science for Year 7 - Class 7

1. What is the Earth's atmosphere composed of?

Ans. The Earth's atmosphere is primarily composed of nitrogen (about 78%) and oxygen (about 21%), along with small amounts of other gases such as argon, carbon dioxide, and water vapor.

2. How does the Earth's atmosphere help regulate the planet's temperature?

Ans. The Earth's atmosphere acts as a protective blanket around the planet, trapping heat from the sun through the greenhouse effect. This helps regulate the temperature on Earth and prevents drastic temperature fluctuations.

3. Why is the ozone layer important in the Earth's atmosphere?

Ans. The ozone layer in the Earth's atmosphere plays a crucial role in protecting life on Earth by absorbing most of the sun's harmful ultraviolet (UV) radiation. Without the ozone layer, excessive UV radiation could cause harm to living organisms.

4. How does air pressure change with altitude in the Earth's atmosphere?

Ans. Air pressure decreases with increasing altitude in the Earth's atmosphere. This is because the weight of the air above decreases as altitude increases, leading to lower air pressure at higher elevations.

5. What is the importance of the Earth's atmosphere for sustaining life on the planet?

Ans. The Earth's atmosphere is essential for sustaining life on the planet as it provides oxygen for respiration, regulates temperature, shields from harmful radiation, and enables weather patterns that support ecosystems and agriculture.

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Oct 05, 2025 Last updated

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	IGCSE Cambridge Science for Year 7 32 videos\|61 docs\|22 tests

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32 videos|61 docs|22 tests

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