D. Answer the following questions in brief.
1. What is insolation? Why is it important for the living being on Earth?
2. On what basis are the heat zones divided? How many heat zones are there?
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1. insolation is the process by which sunrays reach the earth . Sunlight is source of light and energy on earth.
2. on the basis of sunlight the heat zones are divided .There are three heat zones - torrid,temperate and frizid.
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