The viscosity of magma is lowered by ________.
A. increasing temperature
B. decreasing SiO2 content
C. decreasing crystal content
D. All of these choices are correct.
Answer: D
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Surface Weather Map
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Refer to the above surface weather map.
At which of the following positions is the warm sector located?
A. 1 B. 2 C. 3 D. 4
A weather forecast that predicts that future weather will be the same as present weather is called ____
A) a steady-state forecast B) the trend method C) a persistence forecast D) the analogue method
Island arc systems now on the Tibet plateau record subduction prior to the collision of India with Eurasia. Geologists would map these pre-collisional arc rocks as ________
A) rift zones B) hot spot tracks C) terranes D) pre-collisional transform zones
Which one of the following would contribute most to acid precipitation falling in the northeastern United States?
A) Ozone forming during morning rush hour in Buffalo, New York B) Coal-fired power plants in northeastern Canada C) Coal-fired power plants in the Midwest D) Nuclear power plants in the region