The current practice of geothermal power generation may not always provide a practical renewable energy source because ________
A) geologically heated groundwater is unsuitable for these plants and must be purified first
B) in some cases, the heated groundwater is used much faster than it is recharged
C) in many cases, the magma is used faster than it is recharged
D) power plants have high maintenance costs
E) in some instances, pollution emissions can be very high
Answer: B
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