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← GeographyWhat outcome results from increased silica content during pyroclastic eruptions?
A)More widespread ashfall distribution
B)Formation of welded tuff deposits✓
C)Development of shallow, low-angle cones
D)Increased rates of basaltic lava flows
💡 Explanation
Welded tuff results when heated pyroclastic flows compact; because the increased silica yields higher viscosity, it creates dense layers. Therefore, higher silica pyroclastic flows are better explained as forming welded tuff rather than ashfall because atmospheric dispersion isn't the main Silica factor.
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