What chemical is responsible for depleting the Earth's ozone at a rapid rate?
a. DDT
b. PCBs
c. CFCs
d. Carbon dioxide
ANS: C
Chlorofluorocarbons, CFCs, were used in various coolants and pressurized canisters. These chemicals
were being converted by light energy into compounds that were attacking and depleting the ozone.
Information can be found in the section Human Activity is Causing Global Oceanic Change.
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What is an internal cost of driving a domestic car?
A. Air pollution and litter B. Cost of materials used in manufacture C. Highway accidents D. Health costs E. Hazardous wastes produced by car exhaust
Each UTM zone covers ________ degrees in longitude:
A. 5 B. 6 C. 7 D. 4
Approximately three-fourths of the world's tar sands resources are located in which country?
A. the United States B. Russia C. Canada D. Iraq E. Ukraine
Which passive continental margin province is located at the foot of the margin?
a) Water shelf b) Shelf break c) Slope d) Rise e) Abyssal plain