What chemical poses the most danger to the ozone layer?
A) chlorofluorocarbons (CFCs)
B) dihydrogen oxide
C) dioxin
D) polychlorinated biphenyl
E) triple-bonded oxygen (O3 )
A
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The least concentrated form of energy is
A. in substances near absolute zero. B. thermal energy. C. gasoline and fossil fuels. D. in spontaneous biological processes.
What do we call new suburbs that include retailing, industry, office, and entertainment activities, but are less connected to the central city, and more connected to other suburban centers?
A) concentric zones model B) edge cities C) counterurbanization D) urban decentralization E) urban realms model
What is defined here? "mixtures of ice and rock like dirty snowballs"
A) comets B) meteors C) asteroids D) meteorites
The current level of atmospheric ________ recently surpassed 400 parts per million
A) carbon dioxide B) chlorofluorocarbons C) methane D) nitrous oxide E) water vapor