National Geographic : 1973 Jan
ANTHONYBOCCACCIO(ABOVEAND RIGHT)ANDJAMESP. BLAIR(LEFT) Rift that builds a nation: Fractures and massive subsidence trace the rift of the Mid-Atlantic Ridge across Iceland's bleak countryside (right). Its spreading steadily adds to the nation's size: Scien tists such as Iceland's Dr. Sigurdur Thorarinsson believe that as recently as 15 million years ago Iceland rose Surtsey like from the sea. Violent eruptions and steady upwelling of magma have built the island of today.