Q23 of 95 Page 123

What is global warming? Name the gas responsible for causing global warming.

Global Warming is the increase of Earth's average surface temperature due to effect of greenhouse gases, such as carbon dioxide emissions from burning fossil fuels or from deforestation, which trap heat that would otherwise escape from Earth. the gas responsible for causing global warming is carbon dioxide.


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21

What is desertification? Name one human activity which may lead to desertification.

 22

Explain how, deforestation makes the soil infertile leading to desertification.

 24

How does deforestation reduce rainfall on the one hand and lead to floods on the other?

 25

Define the term ‘biosphere’.