Where are tornadoes most common?
A. North Africa
B. the U.S.
C. Brazil
D. Australia
Answer: B
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When excess nitrogen from industrialized agricultural fields enters rivers as runoff, which of the following happens first?
A. It promotes the growth of algae. B. It is consumed by bacteria. C. The nitrogen directly depletes the oxygen. D. The nitrogen poisons the fish.
According to the theory of isostasy, the crust:
a. tends to establish a uniform elevation over the entire earth b. tends to establish an elevation directly proportional to its density c. tends to establish an elevation inversely proportional to its density d. is fixed and cannot change in elevation
The type of stress that causes most folding is
A. compression. B. tension. C. confining pressure. D. fluid pressure.
Judge the following sentence according to the criteria given below: The concentration of marine life increases as the distance from the continental margins into the open sea increases BECAUSE the continents are the major sources of the nutrients
phytoplankton needed for the process of photosynthesis. A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.