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Why is the atmosphere essential for life?


The atmosphere consists of gases like nitrogen, oxygen, carbon dioxide and water vapour. All these gases are very essential for the survival of organisms. The atmosphere keeps the average temperature of the earth fairly steady and thus makes conditions suitable for the survival of organisms. The atmosphere prevents the sudden increase in temperature during the daylight hours. It also slows down the escape of heat into outer space during the night, keeping the Conditions favourable. Because of all these reasons atmosphere is very important. 

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How is our atmosphere different from the atmosphere on Venus and Mars?


Atmosphere of the our atmosphere consists of a mixture of many gases like nitrogen, oxygen, carbon dioxide and water vapour that helps life to exist on the earth.

The major component of the atmosphere found on the Venus and Mars is carbon dioxide (95-97%), thus it does not support life.

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What causes winds?


The uneven cooling of land and sea and the building of the low and high pressure area causes the air to move from a high pressure are to a low pressure area. This movemnet of the air from one region to the other region caused winds.

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List any three human activities that you think would lead to air pollution.


Man made sources of air pollution:

(i) Use of diesel and petrol in vehicles.

(ii) Burning of coal in factories, engines and thermal power stations.

(iii) Deforestation.

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How are clouds formed?


A large amount of water evaporates from the water bodies and goes into the air. Some amount of water vapour also gets into the air due to various biological activities. The hot air rises up carrying the water vapour with it. As the air rises up, it gets cooled. Cooling causes the water vapour in the air to condense in the form of tiny droplets around dust and other suspended particles in the air. This leads to the formation of clouds.

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How does the atmosphere act as a blanket?


Our atmosphere acts as a blanket because:

(i) It keeps the average temperature of the earth fairly constant during the day.

(ii) The atmosphere prevents the sudden increase in temperature during the daylight hours.

(iii) During the night, it slows down the escape of heat into outer space nad maintain ptimum temperature. 

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