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Does pressure have any effect on Volcanic eruptions?
Question Date: 2003-11-19
Answer 1:

Pressure is what drives volcanic eruptions. The liquid rock under the Earth's surface is squirted forth by the pressure of all the rock above it. As the pressure drops as the magma comes up, the gas dissolved in the magma comes out of solution and expands. This expansion drives the explosive eruptions that generate ash clouds, and the lava pours out of the vents.

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