A self-amplifying reaction and a nuclear explosion in a nuclear power plant are prevented in large part by ________
A) the regular addition of uranium-239 to the fuel
B) control rods that absorb extra neutrons
C) "sponges" that absorb liquefied uranium that leaks out of the reactor core
D) the production of plutonium-239
E) fuel rods that absorb tremendous amounts of heat
B
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What soil texture supports the growth best in the majority of plants?
A) loam B) an even mixture of clay, sand, and silt C) silt D) both A and B
People produce many kitchen wastes each day, such as discarded egg shells, orange and banana peels, and coffee grounds. Living at the edge of town, you have several options for waste disposal
Which of the following would be the most likely to prevent natural decay of your kitchen wastes? A) Collecting your kitchen garbage in small plastic bags and disposing of it in a large city landfill B) Collecting your kitchen garbage in paper bags and disposing of it in a large city landfill C) Spreading your kitchen wastes on the top of a garden D) Burying your kitchen wastes deep in your garden soil
The saying "the dose makes the poison" means that
A. Nearly anything can be toxic at some level B. Some things are more poisonous than other things C. Toxic materials are measured in doses of lethal amounts D. All things are equally poisonous at equal doses E. Almost nothing is toxic at low levels
In 2008, Russian troops entered the __________ region to support its move towards independence from __________.
a. South Ossetian ; Georgia b. Abkhazia; Transcaucasia c. South Ossetian; Chechya d. Adjara; Georgia e. South Ossetian ; Transcaucasia