Which of the following materials would make the best aquitard?
A) Gravel
B) Sandstone
C) Clay
D) Conglomerate
Answer: C
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The gradient of streams tends to be ____________________ in their upper reaches and
____________________ in their lower reaches. Fill in the blank(s) with the appropriate word(s).
Second-growth forests ________
A) in North America are mostly in British Columbia and Alaska B) are forests that establish themselves after virgin timber has been removed from an area C) are less abundant on Earth today than they were 500 years ago D) are forests whose timber has second-rate value E) are those forests in the National Parks that are protected from logging
Which region of the earth has warmed almost twice as fast as the global average over the past 50 years?
A. Africa B. Pacific Ocean C. Indian Ocean D. Arctic E. Western Hemisphere
The mercurial barometer was invented by ________
A) Torricelli B) Newton C) Galileo D) Watt