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 ...

Why it's incredible: The volcano's crater lake is as acidic as ... hidden life thriving in Earth's most acidic and alkaline lakes Kawah Ijen crater lake's bluish-green color is so bright, it's ...