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← GeographyWhich outcome is caused when lava encounters seawater?
A)Formation of pillow lava structures✓
B)Increased viscosity of molten rock
C)Expansion of the Earth's crust
D)Instantaneous rock melting
💡 Explanation
Rapid cooling creates pillow lava because heat flux causes instantaneous phase change at the interface. This sudden solidification traps the molten material, forming rounded structures, rather than increased viscosity; therefore, the other options are less directly linked to initial contact.
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