There has been some success demonstrated in controlling lava flows by using ____
a. ?water to harden the leading edge of the flow
b. ?bulldozed trenches for the lava flow to follow
c. ?high explosives to disperse the lava over a wide area to cool
d. ?levees of older lava to funnel the flow into a valley
e. ?aerial bombing of the volcano caldera
ANSWER: a
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