Which outcome occurs when mountain stream sediment delivery outpaces floodplain fluvial erosion?

💡 Explanation

Alluvial fans develop because sediment deposition exceeds fluvial erosion; therefore, the stream builds outwards rather than laterally eroding its banks. Channel avulsion enables continued deposition; rather than lake formation or cut-off, the slope promotes deposition and alluvial expansion.

• Which speleothem formation rate declines inside deep cave systems?
• Which outcome occurs when river deposition overwhelms erosion?
• Which failure type is accelerated as permafrost thaws?
• Which mechanism causes the formation of oceanic 'garbage patches' within subtropical gyres?
• Which geological effect arises from the constant stress-and-release mechanism along a transform fault boundary intersecting continental crust?
• During prolonged droughts, which outcome disproportionately affects silty topsoil?