As Magma Approaches the Surface, Water Contributes to the Explosive

question 47

Multiple Choice

As magma approaches the surface, water contributes to the explosive potential of the eruption because _______ .

• A) water has a lower density in its solid phase than its liquid phase which makes it explode when pressure decreases
• B) water dissolved in magma flashes to steam as pressure decreases, and the volume increase leads to an explosive potential
• C) water dissociates to hydrogen and oxygen at high temperatures but reacts violently at decreasing pressures to produce explosive eruptions
• D) water has a large heat capacity, which allow it to keep the magma hot enough to explode

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