Which is the principle behind wetlands-based sewage treatment systems?
A. Mimic natural processes in a series of tanks filled with aquatic plants.
B. Use high strength chemicals to disinfect large amounts quickly.
C. Let nature take care of it by dumping raw sewage in rivers.
D. Simply pour sewage into existing, unlined natural wetlands.
Answer: A
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Water flows into the cracks in a boulder and freezes. The water expands and pushes the rock apart. What surface process is this?
A) differential weathering B) fast weathering C) mechanical weathering D) chemical weathering
The most popular form of birth control in poor countries is
A) sterilization. B) birth control pills. C) abortion. D) intrauterine devices. E) abstinence.
How would a country, such as Bangladesh, be affected by a 2 m rise in sea level? What will be an ideal response?
Pollution without a central source of origin is termed
A) air pollution. B) regional-scale pollution. C) water pollution. D) nonpoint-source pollution. E) a renewable resource.