Examples of key gases found in Earth's atmosphere.

📚 Quick Study Guide

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• Nitrogen (N₂): Makes up about 78% of the atmosphere. It's crucial for plant growth and is relatively inert.
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• Oxygen (O₂): Accounts for approximately 21% of the atmosphere and is essential for respiration in most living organisms.
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• Argon (Ar): An inert gas comprising about 0.93% of the atmosphere.
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• Carbon Dioxide (CO₂): A greenhouse gas present at about 0.04%. It's vital for photosynthesis but also contributes to climate change.
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• Other Trace Gases: Includes neon (Ne), helium (He), methane (CH₄), krypton (Kr), hydrogen (H₂), nitrous oxide (N₂O), ozone (O₃), and water vapor (H₂O). These have varying effects on weather and climate.

🧪 Practice Quiz

1. Which gas makes up the largest percentage of Earth's atmosphere?
   1. Oxygen
   2. Carbon Dioxide
   3. Nitrogen
   4. Argon
2. Which of the following gases is essential for respiration in most living organisms?
   1. Nitrogen
   2. Carbon Dioxide
   3. Oxygen
   4. Argon
3. What is the approximate percentage of oxygen in Earth's atmosphere?
   1. 78%
   2. 0.93%
   3. 0.04%
   4. 21%
4. Which gas is a significant contributor to the greenhouse effect?
   1. Nitrogen
   2. Oxygen
   3. Argon
   4. Carbon Dioxide
5. Which of the following is an inert gas found in Earth's atmosphere?
   1. Methane
   2. Ozone
   3. Argon
   4. Water Vapor
6. Which trace gas helps protect the Earth from harmful ultraviolet (UV) radiation?
   1. Methane
   2. Ozone
   3. Carbon Dioxide
   4. Nitrous Oxide
7. What is the approximate percentage of Argon in Earth's atmosphere?
   1. 21%
   2. 78%
   3. 0.04%
   4. 0.93%