An effusive eruption ____,whereas an explosive eruption _____.
A) is an outpouring of low-viscosity magma onto the ground;is a violent explosion of magma,gas,and pyroclastics
B) produces composite volcanoes;produces shield volcanoes
C) is a violent explosion of magma,gas,and pyroclastics;produces shield volcanoes
D) produces composite volcanoes;is an outpouring of low-viscosity magma onto the ground
E) results from magma produced by subducting oceanic plates;originates in the asthenosphere and upper mantle
Correct Answer:
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A)pahoehoe.
B)obsidian.
C)peridotite.
D)scoria.
E)aa.
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A)shield-shaped volcanoes.
B)plateau
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