Which long-term outcome results as a tectonic valley fills with sediment eroded through hydraulic action from a central, elevated source?

💡 Explanation

Alluvial fans develop because sediment deposition occurs as stream gradient decreases sharply at valley bottoms, thus the sediment load spreads outwards, rather than forming sorted layers like deltas; therefore, it's an alluvial fan rather than simply a river.

• Which outcome occurs when increased rainfall accelerates chemical weathering?
• Which effect promotes plankton blooms when coastal upwelling transports deep water towards the surface?
• Which mechanism causes lobe-shaped surfaces in permafrost regions?
• Which risk increases approaching the oxbow's filled state?
• Which process primarily causes cyclical avulsions of a river across its alluvial fan?
• Which hillside outcome primarily occurs when freeze-thaw exceeds drainage?