11. A smog that occurs due to low temperature and has reducing environment is  
						
					12. The earth's radiation is often referred to as ________radiation, while the sun's radiation is often referred to as _________radiation.
						
					13. Increased surface UV leads to increased  __________ ozone
						
					14. Photochemical smog is called
						
					15. The albedo of the earth's surface is only about 4%, yet the combined albedo of the earth and the atmosphere is about 30%. Which set of conditions below best explains why this is so?
						
					16. The slow rate of decomposition of fallen logs in nature is due to their  
						
					17. A high Biological Oxygen Demand (BOD) indicates that:
						
					18. Thorn-forests are found in the _______ regions.
						
					19. Green plants are absent in deep sea. Why?
						
					20. Euro II standard refers to _________
						
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