Final answer:
A long and narrow inlet carved by moving glaciers is called a fjord, which is characterized by its U-shaped valleys, steep cliffs, and formation due to glaciation.
Step-by-step explanation:
The name for a long and narrow inlet carved by moving glaciers is a fjord.
Fjords are created through the process of glaciation over thousands of years, resulting in U-shaped valleys that extend below sea level and are typically surrounded by steep cliffs.
Such features were formed by valley glaciers, examples of which include the impressive landscapes of the Aletsch glacier in Switzerland and the now smaller glacial remnants found in Glacier National Park (GNP) in the United States.