Why does lava containing large amounts of dissolved gases generally produce a more violent explosion than lava that contains small amounts of dissolved gases?

Answer 1

Lava containing large amounts of dissolved gases can produce more violent explosions because the gas bubbles rapidly expand as they ascend towards the surface, leading to increased pressure. When this pressure exceeds the strength of the surrounding rock or lava, it can cause a violent eruption as the gases escape explosively. In contrast, lava with fewer dissolved gases experiences less pressure buildup, resulting in more effusive, less explosive eruptions. Thus, the gas content significantly influences the eruption's intensity and style.