Which condition dictates fjord depth restriction at sill?

💡 Explanation

Fjord sills are formed by differential glacial erosion; Ice Sheet Flow directs increased erosion shallower because greater pressure melts basal ice layers rather than deeper in trough, therefore glacial ice sheet dynamics, rather than other factors drive fjord's restriction depth.

• What erosional outcome significantly increases where persistent katabatic winds encounter exposed bedrock outcrops?
• Which risk increases when heavy tephra accumulates after eruption?
• Which phenomenon is intensified when the ascending branch of a Hadley cell overlaps with a warm ocean current?
• Which consequence results when soil saturation accelerates deflation?
• Which outcome occurs when rapid progradation in alluvial coastal plains restricts accommodation space?
• Which mechanism causes the highest stream discharge rates in mountainous regions dominated by glacial ice?