Using the Choices Below, Select the Statement That Best Explains

question 9

Multiple Choice

Using the choices below, select the statement that best explains how dissolved gases drive volcanic eruptions.

• A)As the magma rises, gas bubbles contract, fragmenting the material and expelling it from the vent.
• B)As the magma rises, gases reduce silicate mineral chains by breaking silicon-oxygen bonds; the result is an explosion.
• C)Confining pressure decreases on a rising magma, allowing gas bubbles to expand and fracture the magma.This process further decreases pressure on the magma and will result in an explosive event.
• D)Decreases in confining pressure result in decreasing viscosity of the magma, allowing the magma to ooze from the volcano.

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