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ICSE Class 9 Geography Question 14 of 19

Composition and Structure of the Atmosphere — Question 3

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Question

Question 1(c)

Give a reason for each of the following:

(i) We find it difficult to breathe when we climb mountains.

(ii) The atmosphere is the most dynamic entity.

(iii) All the weather phenomena takes place in the troposphere.

Answer

(i) We find it difficult to breathe when we climb mountains because the layers of atmosphere become thinner at high altitudes. This means that there is less pressure to push the air into the lungs and a lower percentage of Oxygen in the air. This makes it harder to breath.

(ii) The atmosphere is the most dynamic entity because of its composition. Large masses of air are being moved up and down and across the surface of the Earth.

(iii) The troposphere is characterised by regular decrease in temperature with altitude. This decrease in temperature is known as normal lapse rate. The average decrease is 1°C for every 166 metre altitude gain. This temperature variation is responsible for many turbulences which result in all weather phenomena taking place in the troposphere.