What was the origin of the gas that killed 1,700 people in Cameroon in 1996?
A. It flowed down the side of an erupting volcano.
B. It leaked upward from basaltic magma underlying a lake.
C. It was released in a lateral blast of a cinder cone.
D. It was released from a geyser in a nearby national park.
E. It was formed when acid rain fell on volcanic soils.
Answer: B
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What will be an ideal response?