Class 1 Exam > Class 1 Videos > Science Olympiad for Class 1 > Air Around Us
Air Around Us Video Lecture | Science Olympiad for Class 1
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FAQs on Air Around Us Video Lecture - Science Olympiad for Class 1
| 1. What is air and why is it important? |  |
Ans. Air is the mixture of gases that surrounds the Earth. It consists mainly of nitrogen (78%) and oxygen (21%), with traces of other gases. Air is important because it is essential for the survival of all living organisms. It provides oxygen for us to breathe, helps in regulating the Earth's temperature, and supports the water cycle.
| 2. How is air polluted and what are the effects of air pollution? | |
Ans. Air can be polluted by various sources such as industrial emissions, vehicle exhaust, and burning of fossil fuels. The pollutants released into the air can have harmful effects on both the environment and human health. Air pollution can lead to respiratory problems, cardiovascular diseases, and even contribute to climate change.
| 3. How does air circulate around the Earth? | |
Ans. Air circulates around the Earth due to the uneven heating of the Earth's surface by the Sun. The warm air near the equator rises, creating a low-pressure area, while the cooler air near the poles sinks, creating a high-pressure area. This pressure difference causes air to move from high-pressure areas to low-pressure areas, creating wind patterns.
| 4. How does air help in the water cycle? | |
Ans. Air plays a crucial role in the water cycle. When the Sun heats the surface of the Earth, it causes water to evaporate, turning it into water vapor. This water vapor rises into the atmosphere and condenses to form clouds. Eventually, the condensed water droplets fall back to the Earth as precipitation, such as rain or snow, completing the water cycle.
| 5. Can air be compressed or expanded? | |
Ans. Yes, air can be compressed or expanded. Air is made up of molecules that are constantly moving and colliding with each other. When air is compressed, the molecules are forced closer together, resulting in a decrease in volume. On the other hand, when air is expanded, the molecules move farther apart, causing an increase in volume.
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Nov 22, 2024 Last updated |
Video Description: Air Around Us for Class 1 2024 is part of Science Olympiad for Class 1 preparation.
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