The typical shape of most volcanoes is
A) conical.
B) cylindrical.
C) domical.
A) conical.
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Humid air is actually less dense than dry air because
A) lighter air molecules like O2 and N2 are replaced by heavier H2O molecules B) heavier air molecules like O2 and N2 are replaced by lighter H2O molecules C) the greenhouse effect is enhanced when the humidity is high D) the greenhouse effect is reduced when the humidity is high
Methods to contain and clean up an oil spill ____
A) ?are most efficient if begun within 24 hours of the disaster B) ?cost less today than they did 20 years ago C) ?sometimes cause more damage than the oil itself D) ?are best when the oil is dispersed by chemicals sprayed on the ocean surface
What was the cause of the slowdown in the economic growth rates of industrialized countries in the mid-to-late 1970s?
A) government anti-inflation policies B) international free trade agreements C) the Cold War D) increase in oil prices E) all of the above
The mass of a population of fish present at a given time is called its ________
A) diversity B) fish stock C) maximum sustainable yield D) recruitment mass E) standing stock