Class 11 Exam > Class 11 Videos > NCERT Class 11 Geography- 1 Chapter 8: Structure and Composition of Atmosphere
NCERT Class 11 Geography- 1 Chapter 8: Structure and Composition of Atmosphere Video Lecture
FAQs on NCERT Class 11 Geography- 1 Chapter 8: Structure and Composition of Atmosphere Video Lecture
| 1. What is the structure of the atmosphere? |  |
Ans. The atmosphere is divided into five layers: troposphere, stratosphere, mesosphere, thermosphere, and exosphere. The troposphere is the lowest layer where weather phenomena occur, while the stratosphere contains the ozone layer. The mesosphere is above the stratosphere and the thermosphere is next, followed by the exosphere which merges with outer space.
| 2. What is the composition of the atmosphere? | |
Ans. The atmosphere is primarily composed of nitrogen (78%) and oxygen (21%). Other gases such as carbon dioxide, argon, neon, methane, and ozone are present in smaller amounts. Water vapor is also a significant component, although its concentration varies.
| 3. How does the composition of the atmosphere affect weather and climate? | |
Ans. The composition of the atmosphere plays a crucial role in weather and climate. Greenhouse gases like carbon dioxide and methane trap heat, leading to the greenhouse effect and global warming. Changes in the concentration of these gases impact climate patterns and lead to extreme weather events such as heatwaves and hurricanes.
| 4. What is the significance of the ozone layer in the atmosphere? | |
Ans. The ozone layer is a region in the stratosphere that contains a high concentration of ozone molecules. It plays a vital role in protecting life on Earth by absorbing most of the sun's harmful ultraviolet (UV) radiation. This absorption prevents the UV rays from reaching the Earth's surface, reducing the risk of skin cancer and other adverse health effects.
| 5. How does the atmosphere affect the Earth's temperature? | |
Ans. The atmosphere acts as a blanket around the Earth, trapping heat and regulating its temperature. The greenhouse effect, caused by certain gases in the atmosphere, allows sunlight to enter but prevents a significant portion of the heat from escaping back into space. This natural process helps maintain a stable temperature range suitable for life on Earth.
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Nov 25, 2024 Last updated |
NCERT Class 11 Geography- 1 Chapter 8: Structure and Composition of Atmosphere for Class 112024 is part of Class 11 preparation. The notes and questions for NCERT Class 11 Geography- 1 Chapter 8: Structure and Composition of Atmosphere
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