Which mechanism causes alluvial fan formation commonly observed in arid intermontane basins?

💡 Explanation

When a stream flows from a narrow canyon onto a flat plain, a decrease in water velocity and flow capacity triggers sediment deposition because of reduced energy in the water. Therefore decreased flow capacity and deposition results, rather than abrasion, faulting, or volcanic activity that produce fans under different conditions.

• Near subduction plate boundaries, which risk increases when fault locking intensifies?
• Which effect occurs when extensive grassland is overgrazed within a loess deposit region, exposed to seasonal wind?
• Which outcome occurs when freeze-thaw cycles induce solifluction on a hillslope supporting pipeline infrastructure?
• Which outcome accelerates when thawing permafrost exposes previously frozen organic matter to aerobic conditions?
• Which outcome develops when wave action erodes headlands?
• Which geomorphic outcome accelerates when Arctic permafrost thaws containing large amounts of trapped organic matter?