When increased base level reduces stream gradient, which outcome is accelerated?

💡 Explanation

Lateral erosion increases when streams slow because decreased gradient reduces velocity, therefore enhancing meander migration that evolves drainage divides promoting **avulsion**, rather than promoting upstream incision or delta building.

• Which geomorphological feature develops when reduced stream gradient promotes vertical alluvial deposition along a floodplain?
• Which risk increases when constructing a multi-story building foundation on unconsolidated alluvial soil near seismic fault lines?
• Which outcome results when subsidence occurs unevenly beneath a levee during a prolonged drought?
• Which secondary effect consistently results when a deep-sea trench forms at a subduction zone?
• Which mineral transformation is promoted by hydration weathering?
• During prolonged droughts, which outcome disproportionately affects silty topsoil?