Geography
Why Fjords Are Unique Fingerprints of Past Ice Ages
Quick fact
Fjords can be over 1,000 meters deep—far deeper than the adjacent ocean, and many have a rocky 'sill' at their mouth that separates the deep basin from the open sea.
Why this is interesting
You’ve probably seen pictures of Norway’s soaring cliffs rising straight from the sea—but did you know that those dramatic inlets were carved by rivers of ice, not water? And why do fjords get deeper inland, not at the coast?