Which material is most commonly used to shield ourselves from radioactive materials?
A) glass
B) iron
C) lead
D) paper
C
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Gold is removed from the rock that contains it by a series of leaching operations that all involve the use of
a. sulfuric acid b. nitric acid c. arsenic d. highly toxic cyanide salts e. mercury
Earth's atmosphere is able to gradually refract light rays:
A) only when it is very dry. B) only when the sun is very high in the sky. C) because of the changing density of air as you get closer to the surface. D) because of air pollution that is present.
NEPA requires an Environmental Impact Statement (EIS) for every
A. federal project having possible environmental side effects. B. state and local action potentially affecting the environment. C. federal project having significant consequences for environmental quality. D. proposal that would increase pollution of the nation's air or water.
Suppose a column of air has constant air temperature. What would happen if we force more air into the column?
A) The air would become less dense, and the surface air pressure would increase. B) The air would become more dense, and the surface air pressure would decrease. C) The air would become less dense, and the surface air pressure would decrease. D) The air would become more dense, and the surface air pressure would increase.