Which outcome occurs when mafic lava erupts underwater?

💡 Explanation

Pillow lava forms because rapid cooling via contact occurs in underwater mafic lava flows, resulting in rounded shapes from outward pressure and chilled margins; therefore, pillow lava forms, rather than obsidian because that needs subaerial slower cooling.

• Which horizon develops advanced leaching during active pedogenesis?
• Which destructive mudflow emerges when volcanic tephra accumulates?
• Which mineral precipitation pattern results when cave air mixes with carbon dioxide?
• Which process explains the cyclical resurgence of lava domes within volcanic calderas?
• Which process causes increased sediment deposition in a proglacial lake?
• Which mechanism causes large-scale crustal deformation when a continental plate overrides an oceanic plate at a subduction zone?