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← GeographyWhich major outcome develops because of excessive magma viscosity during effusive underwater eruptions?
A)Formation of pillow lava structures✓
B)Increased hydrothermal vent formation
C)Enhanced deep-sea currents upwelling
D)Accelerated biogenic silica accumulation
💡 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.
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