Which of these is not a strategy for stopping an advancing lava flow?
A. Using explosives to punch holes selectively in a flow's hardened crust to divert remaining liquid lava.
B. Constructing a dense, massive plug to stop up the vent from which the magma is erupting.
C. Spraying water on the flow front to cool it.
D. All of these are strategies for stopping an advancing lava flow.
Answer: B
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