Which major outcome develops because of excessive magma viscosity during effusive underwater eruptions?

💡 Explanation

Pillow lava forms because high magma viscosity prevents outflow; therefore, bulbous shapes develop rather than thin flows. This is due to increased cooling rates via sea water that forms on the surface.

• Which outcome occurs when rapid sediment deposition constricts channel width?
• Which mechanism causes the generation of explosive andesitic volcanoes at subduction zones?
• Which secondary effect is intensified when seismic retrofitting is selectively underfunded?
• Which consequence results when deep ocean productivity declines in a gyre?
• Which outcome accelerates the collapse of coastal sea stacks along rocky shorelines?
• Which catastrophic effect is initiated by density currents generated from pyroclastic tephra flows entering a stratified lake?