CBSE Geography Class 7
Air
Air - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Points To Remember:
- Nitrogen is the most plentiful gas in the air.
- Our atmosphere is divided into five layers: Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.
- Moisture in the air at any time, known as humidity.
- There are three types of rainfall: the convectional, the orographic and the cyclonic rainfall.
- Carbon dioxide released in the atmosphere creates a green house effect by trapping the heat.
- Oxygen is the second most plentiful gas in the air
- Green plants use carbon dioxide to make their food and release oxygen.
- Almost all the weather phenomena like rainfall, fog and hailstorm occur in troposphere.
- Stratosphere layer is almost free from clouds and associated weather phenomena hence ideal for flying aeroplane.
- Mesosphere layer helps in radio transmission.
