Ozone in the stratosphere
a. ?is a health hazard for people with respiratory illnesses.
b. ?protects life from harmful ultraviolet radiation.
c. ?is one of the main ingredients of photochemical smog.
d. ?provides healthy levels of vitamin D to humans.
e. ?is an aerosol found in the ionosphere.
ANSWER: b
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Answer the following statement true (T) or false (F)
Which of the following is not true of urban growth trends?
A) The number of megacities is increasing. B) The proportion of people living in megacities is decreasing. C) Cities with populations smaller than 500,000 inhabitants are increasing in number. D) The trend of moving from rural to urban areas will remain strong through 2030.
There has been legislation designed to encourage protection of wetlands, but funding has been greatly reduced, because ________.
a. the ecosystem services of wetlands has been ignored b. there has been no funding available for any federal projects c. green taxes have been opposed by state governments d. wetlands have little or no economic value e. a system of green taxes is already in place to fund the needed work
Which of these common items are made from petrochemicals?
A. glass bottles B. aluminum cans C. plastics and synthetic fibers D. organic fertilizers E. copper wire