Compared to gasoline, producing and burning corn-based ethanol emits ____ greenhouse gases.
A. about 33% as much
B. about 50% as much
C. about 25% less
D. about the same amount of
E. at least 20% more
Answer: E
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Rare in crustal rocks, but abundant in some meteoroids, the presence of a(n) ____________________ layer provides
evidence for a meteorite impact at the end of the Mesozoic Fill in the blank(s) with the appropriate word(s).
With the Linnaean classification scheme, as one moves down the hierarchy, the categories become more ____
A)exclusive B)poorly defined C)inclusive D)general E)broad
The transformation of snow into glacial ice in Antarctica takes ________ than in midlatitude alpine glaciers because ________
A) less time; more snow fall in the polar regions each year slows the glacier formation process B) less time; there is more melting and refreezing in the midlatitudes and, therefore, it takes much longer there C) longer; the long summer days in Antarctica (up to 24-hours) results in more sunlight impeding the glacier development process D) longer; the dryness of the Antarctic climate and minimal snowfall as compared to wetter climates with constant snowfall
Bioassessment uses ________ to determine water quality
A) pH B) dissolved oxygen C) turbidity D) conductivity E) living organisms