Which outcome is caused by gas pressure increase within volcanic domes?

💡 Explanation

Increased gas pressure in volcanic domes causes explosive eruptions because the pressure exceeds the dome's mechanical strength, driving fragmentation, creating erupting tephra via Vulcanian eruptions; therefore, it is tephra, rather than lava, that is ejected, because gas pressure overwhelms magma viscosity.

• Volcanic ash cloud dispersal poses risks; which mechanism governs tephra settling?
• Which outcome accelerates coastal dune migration during storm surges?
• Which shift occurs in coastal upwelling patterns along South America's western coast during an El Niño event?
• Which outcome occurs when extensive loess deposits erode?
• Which mechanism facilitates cave formation in regions with abundant limestone?
• Which ecological outcome results when coastal upwelling is disrupted by increased surface water temperatures?