A radio ad is promoting the increased use of E85 fuel as being economically and environmentally beneficial. There is no mention of disadvantages. You should be skeptical of this ad because ________
A) ethanol fuel may lead to an increase in food prices
B) fossil fuels are required to produce the ethanol required for this blend
C) only certain cars are designed to run on this fuel blend
D) it may take more energy to produce the ethanol than it contains
E) All of these are reasons to be skeptical.
Answer: E
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Which of the following statements about the rock cycle is TRUE?
A) The cooling of magma forms metamorphic rock. B) Sediments form igneous rock via lithification. C) Sedimentary rock forms metamorphic and igneous rock via the process of lithification. D) Weathering and erosion can cause all three rock types to become sediments. E) Sedimentary rock forms metamorphic rock as it erodes.
The Clean Water Act has turned out to be ________ in achieving its point source goals.
A. marginally effective B. a disaster C. very effective D. ineffective
Which one of the following is not a speleothem?
a.) stalactite b.) geyserite c.) stalagmite d.) dripstone
For evaporation of sweat to be an effective cooling mechanism:
A) the relative humidity must be greater than 90%. B) the environmental temperature must be at least 95°F. C) ambient air must be relatively unsaturated with water. D) ambient air must be saturated with a great deal of water.