If a bed strikes north it must ________.
A. be horizontal
B. have a strike of 270 degrees
C. dip south
D. have a strike of 90 degrees
E. dip either east or west
Answer: E
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Pyroclastic flows primarily contain pumice, vesicular pyroclastic material, and ________
A) volcanic mudslides called lahars B) a cloud of low-density hot expanding gases C) low viscosity lava flows D) ultramafic rock debris
When are upper air winds fastest?
A) in winter B) in summer C) anytime surface temperature gradients are weak D) These winds maintain about the same speed throughout the year.
The relationship between recycling, economics, and energy consumption is demonstrated in the case of aluminum, where ________
A) all of the metal recycling industries in the United States went bankrupt by 2009 B) the U.S. failure to recycle aluminum has caused energy to be lost in mining new ore C) it costs more than 10 times as much to produce items from recycled aluminum than from virgin ore D) new cheap mining technologies and huge newly discovered aluminum deposits have made recycling unprofitable E) it requires over 20 times more energy to mine and extract aluminum from bauxite ore than from recycled materials
Generally, polar lows rapidly ____ when they move over land
a. strengthen b. dissipate c. change direction d. shears e. double in strength