Answer
Fiords and glacial troughs are closely related, as fiords are a specific type of glacial trough.
A glacial trough is a deep, elongated valley carved by a glacier. It has a U-shaped cross-section, steep sides, and a flat or gently sloping bottom. Glacial troughs are formed through the erosive action of glaciers as they advance and retreat, scouring the landscape and shaping the valley.
A fiord, on the other hand, is a glacial trough that the sea has flooded. When the glaciers retreat, the sea level rises, filling the trough with water and creating a narrow, deep inlet with steep sides. Fiords typically appear distinct, with towering cliffs rising straight from the water and deep depths below.
Work Step by Step
As per text in section 18.3
