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5.17. In Wikipedia, look up "Caldera" and answer this question: How does a volcanic caldera form?a. An explosive eruption blows out the surface of a volcano leaving a crater behind.b. A large depression in the ground results from the surface falling into an emptying magma chamber.c. Fast moving lava carves out a valley on the side of a volcano.d. An explosive eruption causes a massive landslide on the flank of a volcano powered by escaping hot gas.
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