Which mechanism primarily contributes to the U-shaped profile of a fjord?

💡 Explanation

When a glacier occupies a valley, glacial abrasion and bedrock plucking occur due to the immense pressure and the freeze-thaw cycle, eroding the valley walls and floor, deepening and widening the valley to form a U shape. Therefore glacial erosion creates this shape, rather than chemical weathering, river action, or tectonic forces resulting in a V shape.

• Which phenomenon significantly reduces a river's sediment-carrying capacity when it enters a lake or ocean?
• Which outcome arises when a major river's stream gradient decreases due to regional tectonic subsidence?
• Which risk increases for communities protected by artificial levees during intense, prolonged rainfall events?
• Which topographic feature is primarily formed by glacial erosion within a cirque?
• Which risk increases along strike-slip faults experiencing creep when a locked segment develops?
• Which outcome is more likely when floodplain levees subside unevenly?