Which mechanism causes relatively shallow sill depths at the mouth of many fjords?

💡 Explanation

When glaciers retreat from fjords, isostatic rebound occurs because the land rises unevenly after ice removal, combined with differential erosion rates concentrating at fjord mouths, leading to shallower sill depths. Therefore post-glacial tilt results, rather than other mechanisms which affect sediments or tectonic processes.

• Which outcome occurs when a glacial lake outburst?
• Which mechanism causes regional metamorphism of sedimentary rocks along a subduction zone?
• Which mechanism increases coastal erosion rates when a subducting plate causes uplift of the adjacent landmass?
• Which risk increases when an earthquake occurs near fine-grained unconsolidated sediment deposits?
• Which outcome occurs when wave action undermines a coastal arch, forming offshore stacks?
• Which mechanism primarily deflects geostrophic currents into coastal boundary currents along continental margins?