Which process determines fjord sill depth after glacial retreat ceases and sea levels stabilize?

💡 Explanation

When glacial ice melts, isostatic rebound occurs because the reduced load allows the lithosphere to elastically rebound and the mantle beneath to flow, a process constrained by mantle viscosity, subsequently controlling fjord sill depth. Therefore, lithospheric viscosity in isostatic adjust dictates depth rather than water-based mechanisms, such as thermal expansion or sediment related processes which influence local bathymetry differently.

• Which risk increases when porous alluvial aquifers are rapidly depleted by irrigation pumping?
• Which risk increases significantly due to blocked vent viscous lava?
• Which outcome arises when an extreme flood event exceeds natural levee height along a major river?
• Which mechanism causes persistent volcanic island formation over a mantle plume?
• Which mechanism significantly increases sediment deposition rates at deep fjord basins with seasonal meltwater influx?
• Which consequence results when a transform fault restricts sediment transport?