?
Figure 22.9
Why do raw materials brought to cities require a great amount of resources in order to be converted to a final product?
What will be an ideal response?
Electricity, water, and human labor are more expensive in a city. Transportation costs are more expensive, to transport the raw materials to the city and the ship products to their final destinations.
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Air masses
A) all originate from the same place. B) require one to three months to form. C) vary substantially in important characteristics on the horizontal dimension. D) often have large vertical temperature gradients.
Ozone depletion is caused by ____.
A. chlorofluorocarbons (CFCs) in the troposphere B. chlorofluorocarbons (CFCs) in the stratosphere C. global warming D. the greenhouse effect E. cold air in the polar regions
Distinguish between internal and external processes
What will be an ideal response?
________ is/are biodegradable and known to have (a) short persistence time(s)
A) PCBs B) PBDEs C) DDT D) Bt toxin E) DDE