Q4 of 22 Page 201

What is the greenhouse effect?

Greenhouse effect is a phenomenon that heats the earth’s surface. The greenhouse gases prevent infrared diations from escaping the earth which results in heating of the earth’s surface.


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2

Name two biologically important compounds that contain both oxygen and nitrogen.

 3

List any three human activities which could lead to an increase in carbon dioxide content of air.

 5

What are two forms of oxygen found in the atmosphere?

 1

Why is the atmosphere essential for life?