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Question
The number of human-induced sinkholes in North America has doubled since 1930. Insurance claims increased 1200% from 1987 to 1991, costing nearly $100 million. Several areas in Canada are at risk for sinkhole development . A major reason for this is ________.A) global warming
B) increased rainfall, eroding underground sediments
C) roadway construction, leading to increased runoff
D) increased water consumption
E) decreases in agriculture
Answer
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