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← GeographyWhich mechanism causes dome explosions during effusive volcanic eruptions?
A)Magmatic volatile supersaturation and expansion✓
B)Water table heat transfer and evaporation
C)Gravitational gradient increase on unstable slopes
D)Kinetic energy transfer within fragmented crystals
💡 Explanation
Magmatic volatile supersaturation causes dome explosions because dissolved gases expand rapidly as pressure decreases; therefore, these processes fracture the cooling dome, rather than gravitational shifts destabilizing it.
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