ICSE Solutions for Class 9 Geography – Insolation ICSE Solutions for Class 9 Geography – Insolation Exercises I. Short Answer Questions. Question 1. What is solar radiation ? What is its significance for the earth ? Answer: The sun continuously radiates heat and light energy in all the directions. It is known as solar radiation. Solar radiation is the only primary source of light and heat on the earth. The earth receives its heat from solar radiation which is a tiny fraction of the radiated energy of the sun. Question 2. What is meant by insolation ? State two of its main characteristics. Answer: The amount of solar energy received by the earth is called insolation, but only one part out of two billion parts reaches the earth. So, out of total 100% solar energy only 51% reaches the earth, 35% reflected back to into space and only 14% is absorbed by the ozone layer. Question 3. State two advantages of convectional heating of the atmosphere. Answer: Co...
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