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20. Which one of the following is not a sign of global warming?
A. Increase in ice sheets
B. Decrease in ice sheets
C. Rising sea level

21. According to the IPCC, which year has been the warmest year?
A. 1990
B. 1998
C. 2001

22. Which one is a natural factor of climate change?
A. Deforestation
B. Volcanic eruption
C. Transportation
D. Industry

23. Which one of the following gases strongly absorbs infrared radiation and plays a role in warming the lower atmosphere?
A. Ammonia
B. CO₂
C. Oxygen
D. Sulfuric acid

24. From the greenhouse gases, which gas stays in the atmosphere for about 100 years?
A. CH₄
B. NH₃
C. CO₂
D. N₂O

25. Which one of the following is not a consequence of climate change?
A. Sea level rise
B. Change in precipitation amount
C. Increase in the amount of oxygen
D. Increasing level of CO₂

26. _____ is the process by which molten rock or magma, together with gaseous and solid material, is forced to the surface of the earth.
A. Earthquake
B. Volcanism

27. Which one of the following is different from the others?
A. Erosion
B. Deposition
C. Faulting
D. Weathering

28. _____ is formed when the land _____.
A. Erosion
B. Deposition
C. Faulting
D. Folding

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Final answer:

Global warming is evidenced by rising temperatures, melting ice sheets, and increasing sea levels, often influenced by both natural and human-induced factors.


Explanation:

Global warming refers to the increase in global average air and ocean temperatures primarily caused by the rise in greenhouse gases like carbon dioxide. One of the key signs of global warming is the decrease in ice sheets due to rising temperatures, leading to a rise in sea level. A natural factor of climate change includes phenomena like volcanic eruptions, contributing to atmospheric changes.


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