Air pollution emitted from industrial areas, especially products of combustion, such as oxides of sulfur and nitrogen, can be carried many kilometers downwind. Sometimes these particles and gases slowly settle to the ground in the dry form of ____
a. acid fog
b. acid rain
c. acid precipitation
d. dry deposition
e. wet deposition
ANSWER: d
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Radium-226 is a common isotope on Earth, but has a half-life of about 1600 years. Given that Earth is some 5 billion years old, why is there any radium at all?
A. Radium-226 and Radium-218 undergo a series of transmutation reactions of alpha and beta decay to repeatedly become one another approximately every 1600 years. B. Radium-226 is a "daughter" isotope and the result of the radioactive decay of uranium. C. Radium-226 is one of several self-transmutating isotopes of the elements of the periodic table and is able to replenish itself so that it is never depleted. D. Radium-226 and Astatine-218 are converted back and forth via transmutation to one another at each of their respective half-life cycles.
A geostrophic wind:
A) follows the pressure gradient force. B) curves around to flow toward its original source. C) flows perpendicular to the pressure gradient force. D) is usually not affected by the Coriolis force.
Which of the following describes the compressibility of liquids?
A) They are highly compressible. B) They are slightly compressible. C) They are virtually incompressible. D) Any of these, depending on the liquid.
Which of the following is associated with an active continental margin?
A) Divergent boundaries B) Convergent boundaries C) Transform boundaries D) No tectonic boundaries nearby