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← GeographyWhich process produces graded bedding within alluvial fans?
A)Density variations during sediment deposition✓
B)Progressive lithification of sediment layers
C)Chemical precipitation of dissolved minerals
D)Erosion rates exceeding deposition rates
💡 Explanation
Graded beds in alluvial fans form due to density variations during sediment deposition during flash floods, because coarser materials settle first, then finer particles; therefore, vertical sorting occurs, rather than uniform or reversed stratification.
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