The type of lava erupted by Nyiragongo and many volcanoes in the East Rift zone of Africa, called alkaline lava, has an extremely low viscosity, making it almost as fluid as water. Alkaline lava ...
active volcano, Ol Doinyo Lengai; and the extraordinary Empakaai Crater, a collapsed caldera with a pearly blue alkaline lake. Often called ”Africa’s Eden,” the Ngorongoro Crater is one of ...