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← GeographyWhich outcome occurs when a lava dome obstructs pyroclastic flow channels?
A)Violent redirection and lateral blasts✓
B)Decreased atmospheric ash dispersal slowly
C)Uniform tephra deposits increase gradually
D)Stable cooling with gas diffusion
💡 Explanation
Violent redirection and lateral blasts erupt because channel obstruction increases pressure, triggering sudden **pressure release**. Specifically, a lateral blast occurs rather than plume formation because the lava dome constrains upward expansion, therefore diverting released energy sideways.
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