Which outcome occurs when subsurface magma composition changes during effusive eruption?

💡 Explanation

Lava dome formation occurs because increased silica encourages viscous SURFACE _degassing_, therefore lava quickly solidifies in the vent, rather than generating lateral pyroclastic flows. Lahars needs additional moisture source involvement to occur.

• Which outcome occurs when acidic groundwater encounters soluble bedrock?
• Which mechanism contributes to eruptive style changes by volatile exsolution during magma ascent?
• Which outcome is accelerated across exposed playa when subjected to extreme aridity?
• Which hazard increases when overlying clay erodes above karst?
• Which outcome occurs when a subducting slab stagnates mid-mantle?
• Which process consistently rebuilds sand eroded around coastal stacks?