In August 1986,a Gigantic Volume of CO₂ Belched Forth from Lake

question 53

Multiple Choice

In August 1986,a gigantic volume of CO₂ belched forth from Lake Nyos in Cameroon and swept down the adjacent valleys asphyxiating 1,700 people.The origin of this gas was _____________.

• A) a basaltic magma in the subsurface
• B) a sub-lake pyroclastic flow
• C) an earthquake preceding the volcanic eruption broke a gas pipe running along the bottom of the lake.
• D) the calderas collapse of a volcanic dome at the bottom of the lake

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