Portal:Geophysics/Did you know/1

... that the Gregory Rift in East Africa contains the world's only active carbonatite volcano, Ol Doinyo Lengai (pictured)?
...that one way to calculate distances in terms of latitude and longitude is the Haversine formula?
...that the supercontinent Pannotia only lasted about sixty million years before disintegrating into four continents?
... that the 2002 Sumatra earthquake is considered to be a foreshock of the 2004 Indian Ocean earthquake?