Which outcome occurs when a rapidly eroding mountain range deposits sediment onto a flat plain?

💡 Explanation

An alluvial fan forms because sediment deposition decreases stream competence, causing the water to spread out and build a conical structure. Therefore, a fan forms; rather than a delta, which forms in standing water environments.

• Which geological risk increases when thawing permafrost destabilizes boreal forest soil?
• Which mechanism reduces soil fertility when prolonged floodplain inundation occurs on alluvial plains used for agriculture?
• Which risk increases when polar jet stream meandering amplifies?
• Which mechanism reduces surface salinity in high-latitude oceans when warming temperatures accelerate glacial meltwater outflow?
• Which mechanism causes high-altitude winds in the jet stream to deflect eastward in the Northern Hemisphere?
• Which process causes increased clay mineral formation when plinthite underlies a waterlogged region?