The area north of 66½°N is in darkness when the Sun is directly ________.
A. at the Arctic Circle
B. at the Antarctic Circle
C. over the Equator
D. over 23½°N
E. over 23½°S
Answer: E
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As S- and P-waves travel farther, ____
A)their intensity increases B)the surface waves catch up C)they overtake the surface waves D)the P-S time interval increases E)the P-S time interval decreases
Judge the following sentence according to the criteria given below: The low tide zone typically has an abundance of algae BECAUSE it is almost always submerged
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.
Managing crop competitors and pests has been challenging to agronomists for centuries. One approach, integrated pest management, ________
A) uses no pesticides of any kind B) uses only natural pesticides C) combines synthetic chemical pesticides with biocontrol techniques D) uses only synthetic chemical pesticides E) combines a variety of pesticides to combat the pest
San Diego, California, is in the Pacific Standard Time Zone, while Philadelphia, Pennsylvania, is in the Eastern Standard Time Zone. If it is 1 A.M., Monday, in Philadelphia, what time is it in San Diego?
A) 4 A.M. Sunday B) 10 P.M. Sunday C) 4 A.M. Monday D) 11 P.M. Monday