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← GeographyWhich deformation results when magma viscosity increases within a volcanic lava dome?
A)Radial fracturing becomes more extensive✓
B)Dome effusion rate increases drastically
C)Exfoliation jointing processes are suppressed
D)Plinian eruption intensity substantially increases
💡 Explanation
Increased magma viscosity hinders flow, therefore radial fracturing becomes more extensive in the solidifying dome due to outward pressure; this fracturing releases stress, rather than triggering a Plinian eruption, because high viscosity prevents explosive gas release.
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