Geography
Why Fjord Coastlines Indicate Glacial Retreat History
Quick fact
Some fjords are deeper than the adjacent ocean. Norway's Sognefjord plunges over 1,300 meters below sea level, yet its mouth is only about 150 meters deep!
Why this is interesting
You've probably seen those stunning, narrow inlets with steep cliffs on travel photos—but they aren't just pretty scenery. Why do they exist only where glaciers used to be?