Which process drives magma differentiation at subduction zones?

💡 Explanation

Fractional crystallization causes magma differentiation when minerals solidify and settle, because denser mineral compositions precipitate, creating a residual melt enriched silica; therefore the remaining melt evolves rather than maintaining initial values due to decompression melting.

• Which risk predominates slope failure in mountainous regions with thawing permafrost?
• Which risk increases when long-term creep along a transform fault locks energy without slippage?
• Which process limits reservoir capacity affected by heavy sediment load in an alluvial river?
• Which mechanism creates natural levees bordering a mature alluvial river?
• Which increased hazard occurs when rapid snowmelt saturates an alluvial fan?
• Which mechanism causes the formation of a volcanic arc during oceanic plate subduction?