With reference to lsquo water vapour rsquo consider the following statements 1 It acts like a blanke...........

Geography and Environment (HCS) World climates

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With reference to ‘water vapour’, consider the following statements:

1. It acts like a blanket allowing the earth neither to become too cold nor too hot.

2. It is a variable gas in the atmosphere, which decreases with altitude

3. It increases from the equator towards the poles.

Which of the statements given above is/are correct?

1 only

1 and 2 only

2 and 3 only

1, 2 and 3

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Explanation:

Statement 1 and 2 is correct : Water Vapour absorbs parts of the insolation from the sun and preserves the earth’s radiated heat. It thus, acts like a blanket allowing the earth neither to become too cold nor too hot. Water vapour also contributes to the stability and instability in the air.

Statement 3 is incorrect. Water vapour is also a variable gas in the atmosphere, which decreases with altitude. In the warm and wet tropics, it may account for four per cent of the air by volume, while in the dry and cold areas of desert and polar regions, it may be less than one per cent of the air. Water vapour also decreases from the equator towards the poles.