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
Correct Answer:
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Q16: Pillow lava forms when _.
A)lava is rapidly
Q17: Although it is difficult to get a
Q18: A nuée ardente is composed of fiery
Q19: The dominant gas emitted from volcanoes is
Q20: Earth is the most volcanically active body
Q22: What are the criteria used by geologists
Q23: A dense cloud of pyroclastic materials and
Q24: At convergent plate boundaries, more viscous magmas,
Q25: Basalt plateaus erupt from _.
A)supervolcanoes
B)shield volcanoes
C)fissures
D)lava domes
E)cinder
Q26: Cinder cones _.
A)are large, gently sloped volcanoes
B)often
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