Which outcome regarding silica content results when fractional crystallization modifies magma flows?

💡 Explanation

Felsic melts increase with fractional crystallization because Bowen's Reaction Series removes mafic minerals preferentially; therefore, a lava flow's viscosity increases, rather than experiencing an equilibrium state found between mafic and felsic conditions.

• Which risk increases as coalescing alluvial fans block canyon outlets?
• Which landform primarily results when wind deflation lifts fine particles?
• Which landscape evolution occurs as wind-driven aeolian removal concentrates minerals?
• Which risk increases when pressure builds inside volcanic domes?
• Which long-term outcome results when acidic groundwater saturates subsurface limestone layers?
• Which outcome occurs when subsurface pressure exceeds frictional strength along a fault?