About what percentage of Earth's people live in areas where water shortages are common?
A) 5%
B) 15%
C) 30%
D) 50%
E) 65%
D
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This plot shows the highest flow event that occurred each year on the Yellowstone River between 1924 and the 1990s. What is the maximum size of flood that probably can occur here?
A) Up to 8,000 cubic meters per second
B) More than 8,000 cubic meters per second and less than 9,000 cubic meters per second
C) Anything less than 9,000 cubic meters per second
D) More than 9,000 cubic meters per second is possible
What is the difference between magma and lava?
A. Lava is above the Earth's surface, whereas magma is below. B. Magma is colder than lava. C. Lava is gassier than magma. D. Magma has a higher silicate content than lava. E. There is no difference between magma and lava.
Killer floods are caused by ________.
A. abundant rainfall lasting for days B. the storm surges of tropical cyclones flooding the coasts C. the breakup of winter ice on rivers D. local thunderstorms E. All of these choices are correct.
The _______________ creates a natural boundary to the north. The southern boundary of Europe is the ________________ and includes the islands of Malta and Cyprus as independent countries.
a. None of these is correct b. North Pole; Italian Peninsula c. Arctic Circle; Aegean Sea d. Arctic Ocean; Mediterranean Sea e. Scandinavian countries; Bay of Biscay