Most magma is generated by decreasing the pressure on hot rock.
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Q32: A caldera collapse occurs _.
A)before the eruption
Q33: _ are steep-sided,symmetrical volcanic peaks built of
Q34: This volcano erupted in 1883 in the
Q35: Magma at depth does not contain gas
Q37: Although there are 92 naturally occurring elements,a
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Q41: No magmas contain dissolved gases.
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