Which outcome occurs when rhyolitic lava encounters groundwater?

💡 Explanation

A phreatomagmatic eruption occurs because intense heat from the lava instantly boils the groundwater resulting in steam which rapidly expands; this explosive expansion causes fragmentation, producing large quantities of tephra, rather than gentle outgassing or effusive flow.

• Along a chain of volcanic islands, which outcome occurs when a submerged fracture zone obstructs normal wave propagation?
• What outcome occurs when strong wave refraction focuses energy near a sea stack adjacent to a headland promontory?
• Which outcome results when increased chemical weathering alters the underlying rock during pedogenesis?
• Which mechanism causes uplift when strike-slip fault experiences restraining bend?
• Which primary outcome arises when Ekman transport concentrates floating plastics toward the center of an oceanic gyre system?
• Which influence limits stalactite growth at continental glacial margins?