18,000 m) in diameter; its base, at the sea floor is 190 km (190,000 m) wide.  ( Figure 12.31, p. 378; (2CE, Figure 12.36, p.404)) Mauna Kea , Hawaii, is 10,200 metres from base to top, higher than Mt. Everest is above sea level (8848 metres) -- of course much of Mauna