Rivers of ice

   A fiord is a long, narrow arm of the sea that lies in a steep-walled mountain valley. Of course, there can be fiords only where mountains come down to the edge of the sea.
   A river of ice—a valley glacier—helped make every fiord. The river of ice gouged its valley deeper and deeper as it moved toward the sea. After the ice melted, the sea flooded into the valley.
Norway is famous for its fiords. There are fiords along the coasts of Alaska, Greenland, and Chile, too.