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
Correct Answer:
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Q20: Volcanic ash _.
A)is so small that it
Q21: Any volcanic mud or debris flow is
Q22: Warnings of volcanic mudflows _.
A)are only possible
Q23: The threat of volcanic disaster from volcanoes
Q24: Which statement about the danger of volcanoes
Q26: Harmonic tremors are _.
A)strong earthquakes generated by
Q27: The predominant weather in the Pacific Northwest
Q28: The greatest clear danger posed by California's
Q29: Ash eruptions form their own volcanic _
Q30: The caldera now filled by Crater Lake
A)is
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