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प्रश्न
Choose the correct answer.
21 per cent of the atmosphere is composed of
पर्याय
Helium
Oxygen
Nitrogen
Hydrogen
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उत्तर
Oxygen
APPEARS IN
संबंधित प्रश्न
Demonstrate the formation of convective currents.
Fill in the blank
The layer of air around the earth is called the ________.
Explain in brief the different layers of the atmosphere and the basic functions of the main layers.
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 rate at which the temperature drops in the ____________ is 1°C per 165 metres.
State whether the following is true or false.
The temperature drops at the rate of 1°C per 185 metres in the atmosphere.
Why is the thermosphere important?
Explain the significance of the earth’s atmosphere.
What is an important feature of Stratosphere?
How is ozone important for us?
__________ is the great circle at the centre of the earth.
Match the following.
| 1. | Troposphere | Satellite |
| 2. | Stratosphere | Space craft |
| 3. | Exosphere | Ozone layer |
| 4. | Thermosphere | Meteors |
| 5. | Mesosphere | Weather change |
Why is atmosphere essential for life on earth?
The upper limit of the troposphere is called as ______.
Large jet planes normally fly here ______.
Give Reason:
Exosphere is characterised by aurora Australis and aurora borealis.
______ is the lowest layer of the atmosphere.
The ozone layer protects all life on earth from the harmful ______ rays of the sun.
The air envelope is thicker near the earth’s surface and we go higher the density and availability of air gradually decreases. Why?
The two forms of oxygen found in the atmosphere are
