What ion was used as a tracer in the Cape Cod experiment?
A) chloride
B) bromide
C) dioxide
D) sulfide
Answer: B
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Most ocean surface currents are due to
A) melting polar glaciers. B) river flow into the ocean. C) global winds. D) local winds.
If sediment is from natural sources, why is it considered a water pollutant?
A) it is an out-of-place resource B) it is toxic at its source, so it is also toxic in the water C) it is usually laden with mercury D) it is only a pollutant if it contains agricultural chemicals
Which of the following is NOT a major global trade flow?
A) services B) microelectronics C) automobiles D) steel E) oil
The eye wall of a hurricane:
A) has the highest barometric pressure. B) has the lightest precipitation. C) has the greatest wind speeds. D) lies at the hurricane's outer edge.