Which of the following pollutants has the longest residence time?
A) NO
B) CO
C) NO2
D) Chlorofluorocarbons (CFCs)
E) SO2
Answer: D
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The maritime tropical Pacific (mT) and maritime tropical Gulf and Atlantic (mT) air masses are
A) different from one another because the Pacific air mass usually has lower specific humidity than the Gulf/Atlantic air mass. B) both usually extremely unstable. C) very different because the Pacific air mass is very unstable and the Gulf/Atlantic air mass is usually stable. D) both less active during summer months.
The refraction of light is due to changes in wave
A. direction. B. speed. C. frequency. D. all of the above
By the end of this century, polar bears might be found only in ___________
Fill in the blanks with correct word
What is the difference between a community and an ecosystem?
What will be an ideal response?