Suspended particles from sources in Europe and the former Soviet Union are believed responsible for the brownish cloud layer called ____ that forms over the Arctic each spring.
a. the ozone hole
b. Asian dust
c. Arctic haze
d. acid rain
e. acid fog
ANSWER: c
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The force of gravity on astronauts inside an orbiting space vehicle is
A. zero. B. mainly due to the mass of the space vehicle. C. mainly due to nearby planets and stars. D. mainly due to Earth below.
The internal political geography of the Russian Federation includes a mixture of political units that fall into two categories, the administrative and ____________________.
Fill in the blank(s) with the appropriate word(s).
Older lithosphere is destroyed in association with ________
A) deep-sea trenches B) fracture zones C) hydrothermal vents D) mid-ocean ridges E) spreading centers
The term encapsulation refers to the:
a. process of sealing a landfill with three to four feet of topsoil b. way in which insulation is applied to pipes and wiring systems c. method of sealing disintergrating asbestos d. way in which lead-based paint particles become airborne