______ can be defined as 'very low-pressure system with a very high-speed wind revolving around'.

Cyclone

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Thunderstorm

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Earthquake

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Volcano

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Solution

The correct option is A Cyclone
Where there is a high-speed wind, the pressure of the air is low. When water vapour condenses to water as raindrops, heat is released in the atmosphere. This heat warms the air in the surroundings. This air rises and creates a low-pressure region. More air from other places rushes to this low-pressure zone, heats up and rises. This chain continues, and as a result, a low-pressure system with high-speed wind gets formed. This weather condition is called a cyclone.

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Q. A cyclone can be defined as a very low-pressure system with a very high-speed wind.

Question 9
Which of the statements given below is correct?

(i) In winter the winds flow from the land to the ocean.
(ii) In summer the winds flow from the land towards the ocean.
(iii) A cyclone is formed by a very high-pressure system with very high-speed winds revolving around it.
(iv) The coastline of India is not vulnerable to cyclones.

Q. Coal is a fossil fuel and it cannot be prepared in a laboratory or industry. Because of the formation of coal:

a. is a very slow process.
b. needs very low pressure and low temperature.
c. needs very high pressure and high temperature.
d. causes air pollution.

Select the correct alternatives.

Question 10

State whether the following statements are True or False:
(i) If wind flows from land to the ocean, then it is daytime.
(ii) A very high pressure system, with very high speed wind surrounding it forms a cyclone.
(iii) The coast line of India is not vulnerable to cyclones
(iv) Warm air is lighter than cool air.

Q. What happens when air with a very high content of water vapor goes from a region of high pressure to a region of low pressure? Give reason for your answer.

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