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1. What is the stage of formation of white frost?

2. What is fog?

3. What is the minimum visibility due to fog or mist?

4. What is it called where fog contains smoke?

5. Where is fog most prevalent?

6. What are fogs?

7. What is mixed in fog?

8. What are the four classified forms of cloud?

9. At how many meters height does a cirrus clouds forms?

10. What types of clouds appears like wings?

11. What color of cirrus clouds?

12. At how many meters altitude do cumulus clouds form?

13. Which clouds are black and gray in color?

14. What types of combinations formed by four types of clouds?

15. What is the state of moisture liberated after condensation of water vapor called?

16. What type of rain happens when temperature falls below 0° c?

17. What creates snow flakes?

18. Small spherical solid pieces of ice that fall on the earth in precipitation are called?

19. What are the types of rain?

20. Where at the equator the heaviest rainfall takes place?