The Principal Factor(s) Influencing Upward Magma Migration Before Cooling Is

question 30

Multiple Choice

The principal factor(s) influencing upward magma migration before cooling is (are) :

• A) the climate and temperature regime that affects the land surrounding the volcano.
• B) the time since the last eruption, combined with the density of the rocks overlying the volcano.
• C) the magmatic gas content, combined with magma viscosity.
• D) the magmatic water content.

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