1. The sun is vertically overhead at noon on 21st June at

2. The days are longest at

3. This process of vertical heating of the atmosphere is known as ________

4. Differences in pressure on the earth surface causes:

5. ______ are lines joining places having an equal temperature.

6. The heat energy absorbed by a known area in a fixed time is determined with the help of an instrument called

7. What is Isotherm?

8. The earth radiates energy to the atmosphere in:

9. Maximum insolation is received over the ____________

10. Insolation refers to ________