Which of the following are types of waste that a homeowner can recycle in their backyard as part of a composting project?
a. hedge trimmings
b. food scraps
c. grass clippings
d. discarded paints and stains
e. all of these except discarded paints and stains
E
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Mutagens
A. are fatal to humans in low doses. B. are the primary cause of birth defects. C. are harmful largely as allergens. D. cause changes in cell DNA. E. cannot be passed to future generations.
What is different about the fuel source for nuclear power plants in contrast with the fuel source for coal burning power plants? In other words, which statement only applies to fuel for a nuclear power plant?
A. It must be enriched before use. B. It comes from the ground. C. It must be mined. D. It is not natural.
When the road-building boom came to developing countries in the 20th Century, which form of transportation was most negatively impacted?
A) walking B) horse-carts C) railroads D) airlines E) subways
What is an atoll?
A) polar desert B) high island C) low, coral island D) glacier island E) bushfire