Although there are 92 naturally occurring elements,a mere eight make up more than 98 percent of the Earth's crust.
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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
Q36: Most magma is generated by decreasing the
Q38: The process of mineral formation in a
Q39: The formation of a giant continental caldera
Q40: Some of Earth's most beautiful mountains are
Q41: No magmas contain dissolved gases.
Q42: If the magma reaches the surface,it forms
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