11. The most abundant greenhouse gas in the earth's atmosphere:
12. Frost forms when:
13. A narrow valley with steep sides is known as
14. The temperature to which air must be cooled in order to become saturated is the:
15. The lowest temperature that can be attained by evaporating water into the air is known as the:
16. _________ is a source of all minerals.
17. _________ energy is the energy stored within the earth.
18. The largest brackish water lake situated in Asia is in Orissa. Which is the lake?
19. IUCN is also called as
20. 5th June is observed as
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