That ridge, it was later discovered, extended through the major oceans of the world. It is now called the Mid-Ocean Ridge ... called the Great Global Rift, came very close to land.

A single mid-ocean ridge system connects the world's oceans, making the ridge the longest mountain range in the world. On land, giant troughs such as the Great Rift Valley in Africa form where ...

As well as the basalt that is erupted into the valley ... new ocean basin gets wider and wider. New ocean floor is generated at the diverging boundary, and the edges of the now-split continents get ...