Calderas are formed when ____

A)low-viscosity magma flows out into very large areas and cools
B)pyroclastic flows mix with lava flows
C)the volcanic pipe is plugged and the increase in pressure causes a huge explosion
D)part of a magma chamber drains and the mountain's summit collapses into the vacated space below
E)large explosions at the base of a volcano cause the volcano to collapse


D

Environmental & Atmospheric Sciences

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