An aerial view a region where Africa is splitting.  This can allow magma to rise, making this portion of Africa volcanically active.  The rifting region is mapped out below.

These scientists are studying the cracks that are forming because of the underground rifting..

The East African Rift system is already mostly below sea level.  In a short period of time, geologically speaking, this will be filled with water, and a new ocean will be born.  (Look for the people on the left side of the rift for an idea of the size of this area.)