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प्रश्न
Demonstrate the formation of convective currents.
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उत्तर
Convection currents are set up in the air. To demonstrate their formation, let us consider the following experiment:
Place a candle in a beaker and light it. Now, light an incense stick and bring it to the edge of the mouth of the beaker. Observe the direction of flow of smoke. Now, in a similar way, observe the direction of flow of smoke by placing the stick a little above the candle and then at other regions above the beaker.
You will observe that the direction of flow of smoke is different in all the situations. The patterns of flow of smoke reveal the directions in which hot and cold air move.
संबंधित प्रश्न
How is our atmosphere different from the atmospheres on Venus and Mars?
We often leave the lights switched on and fans running when we are not in the room. We switch on the air-conditioning even though we don’t really need it. We insist on being dropped to school in the car every day. Thus, we waste valuable energy which is generally produced by burning coal and petroleum. As you know, the burning of these fuels release gases that pollute the atmosphere.
Make a list of the similar things that we do without realizing that we are destroying the environment. Think of the ways that we can behave differently.
Fill in the blank
The _________________ is the layer of the atmosphere that help in radio transmission.
The upper part of the thermosphere is called the ______.
This is a picture of a supersonic aircraft.
This layer of the atmosphere is also known to protect living beings from the harmful rays of the sun. How?
Write the significance of the following gases.
Oxygen __________________
Carbon dioxide __________________
Ozone __________________
Match the following.
| 1. | Troposphere | Satellite |
| 2. | Stratosphere | Space craft |
| 3. | Exosphere | Ozone layer |
| 4. | Thermosphere | Meteors |
| 5. | Mesosphere | Weather change |
The part of atmosphere which is consisted of variable gases with uneven composition is called ______.
Give reason:
Thermosphere is also referred to as “Heterosphere”.
The atmosphere is made of ______ different layers.
