The statement that it takes high quality energy to get high quality energy refers to
a. energy resources with low or negative net energy
b. hydroelectric power
c. the economic side of energy production
d. the processes and fuel required to extract and refine some energy sources
e. coal and hydroelectric power
D
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The first national park in the world was ________
A) Grand Canyon B) Yellowstone C) Glacier D) Yosemite E) Death Valley
Your friend says that the helium used to inflate balloons is a product of radioactive decay. Another friend says "no way." With whom do you agree?
A. Helium is an element of the periodic table, not some product of any reaction. Agree with the friend who says "no way." B. Your first friend is correct. Radioactive isotopes emit alpha particles which, in turn, capture electrons and become helium atoms. C. If helium were a product of radioactive decay, we would all be radioactive. Agree with the friend who says "no way." D. Radioactive decay produces alpha particles, not helium. Agree with the friend who says "no way."
Why is the environment in Central Asia relatively clean?
A) low population density B) a strong "green" political movement in the region C) favorable breezes that sweep the heavy industrial pollution that would otherwise permeate the region D) stringent environmental standards and controls E) Soviet environmental policies kept the environment intact
Which of the following best matches the description?Pollutants produced by the interaction of primary pollutants with other molecules or an energy source.
A. primary air pollutants B. particulates C. radon D. photochemical smog E. acid deposition F. ozone G. greenhouse effect H. sulfur dioxide I. thermal inversion J. oxides of nitrogen K. secondary air pollutants