"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
One of the biggest development issues in the world is the education of girls. In the United States and Europe, it has been accepted, but not in Africa and the developing countries.
A sub surface reservoir is needed to hold the water as it heats. The highly pressurized boiling water then rises back to the surface through porous fractured rock, fissures and vents before erupting into the air.
