Q14 of 44 Page 14

What is green house effect?

There are some gases, which prevent the escape of heat from the Earth. An increase in the percentage of such gases in the atmosphere would cause the average temperatures to increase worldwide and this is called the greenhouse effect.

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12 Explain the physical process of fixing atmospheric nitrogen? 13 Give the source of carbon-dioxide and state the reason for its increase? 15 Briefly describe the oxygen cycle? 16 How is the ozone layer depleted?