Mature river meanders can self-seal across their neck, which causes which outcome?

💡 Explanation

Oxbow lakes form when a river's meander bend erodes until the necks meet and the channel straightens, due to the mechanism of meander cutoff; therefore an oxbow lake is left, rather than continued meandering or sediment alterations.

• Which outcome results when low volatile magma's viscosity reaches a threshold?
• Which erosional pattern develops when a retreating glacier carves a U-shaped valley subsequently flooded by the sea?
• Which risk significantly increases along major river valleys adjacent to volcanic areas following substantial pyroclastic flows?
• Which outcome results when a glacier retreats unevenly?
• Which risk increases when a rhyolitic lava dome exhibits block faulting?
• Which mechanism causes the formation of a graben lake when extensional forces act upon the crust?