Which change directly causes alluvial fan deposition at a mountain range exit point?

💡 Explanation

When a stream exits a mountain range onto a plain, decreased slope causes deceleration, reducing sediment carrying capacity due to reduced flow competence. Therefore, deposition occurs (forming an alluvial fan) rather than continued transport, erosion, or altered uplift each requiring increased carrying capacity/power.

• Which atmospheric effect causes deflection of large-scale ocean currents?
• Which process generates seismic waves characterized by high frequency and rapid attenuation during shallow crustal earthquakes?
• Which process triggers explosive volcanism when magma viscosity and dissolved gas content are both high?
• Which process primarily causes the formation of oxbow lakes in low-gradient fluvial systems?
• Which process reduces a lake's water level during stratification overturn?
• Which mechanism causes buoyant magma to ascend during intraplate volcanism?