What are the criteria used by geologists to give a semiquantitative measure of the size of an eruption?
A) number of deaths caused by the eruption and the number of buildings destroyed
B) volume of material erupted and height of the eruption plume
C) size of the pre-erupted volcano and the type
D) temperature and pressure during eruption
E) sizes of pyroclastic materials ejected and the distances they travel from the volcano
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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
Q21: Calderas are formed when _.
A)low-viscosity magma flows
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
Q27: Lava domes form from _.
A)mafic and intermediate
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