What is the main problem that has developed in the Ogallala aquifer?
A. Precipitation is heavier to the east, causing tilting of the entire formation.
B. Overpumping may cause southern parts of the aquifer to go dry in the next 100 years.
C. It has become contaminated with radioactive waste from the Chernobyl accident.
D. None of these.
Answer: B
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The Amazon equatorial rain forest of South America, which extends from the east coast far into the interior, has developed in response to ________ air masses which travel from ________ in the trade wind belt
A) cT; NE to SW B) mT; E to W C) mT; W to E D) mP; E to W
Which of the following is least associated with economics?
A) A miner pans for gold in the mountains of California. B) An artist sells her paintings in an art gallery. C) Studying the sky, a child looks for faces in the clouds. D) A waitress carefully wipes down tables before heading home after a long day.
Which of the following describes the events of the Taconic Orogeny?
A) Closing of the marginal sea caused a volcanic arc to be thrust over the continent B) North America collided with a microcontinent as the marginal sea continued to close C) The sea along North America closed completely as Africa collided with North America D) The rifting of Pangaea opened the modern Atlantic Ocean
Atoms of metallic elements can form ionic bonds, but they are not very good at forming covalent bonds. Why?
A. These atoms are too large to be able to come in close contact with other atoms. B. They are on the wrong side of the periodic table. C. Their valence shells are already filled with electrons. D. They have a great tendency to lose electrons.