A problem with the use of biofuels is ________

A) it has never been successfully produced
B) the United States has outlawed them
C) there is a food versus fuel debate
D) it has emitted more carbon dioxide than fossil fuels
E) it has never been successfully used in trucks


Answer: C

Environmental & Atmospheric Sciences

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Edge cities, "edgeless cities," micropolitan centers, criss-crossing freeways, and interspersed residences with office employment and high-end retailing in polycentric networks characterize

A) megapolitan regions. B) virtual cities. C) Modernist urban planning. D) the reaction to gentrification

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The _______ is the most heavily armored vertebrate, and it evolved in the Triassic. Fill in the blank(s) with the appropriate word(s)

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Different air masses have different stability because

A) the horizontal temperature variation within an air mass is fairly uniform. B) the horizontal temperature variation within an air mass is not uniform. C) the vertical temperature variation within an air mass is fairly uniform. D) the vertical temperature variation within an air mass is not uniform.

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The highest rates of productivity in temperate waters occur in ________.

A. winter B. summer C. fall D. spring E. Productivity is the same during all seasons.

Environmental & Atmospheric Sciences