What best describes the volcanic process of magma with dissolved water vapor and other gases as it nears the Earth surface?
a. Explosive gases such as methane and ethane combine with oxygen and ignite violently in the atmosphere.
b. Pressure on the molten rock lessens the rock rapidly expands to the point that it explodes and ejects into the atmosphere.
c. Pressure on the molten rock lessens and the gases quickly dissipate into the atmosphere.
d. Pressure on the molten rock lessens and the gases dissolved in rock can bubble and expand rapidly causing violent eruptions.
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