…showed first 75 words of 407 total…

…showed last 75 words of 407 total…massive size, which is shown in the Hawaiian Island volcanoes. The Hawaiian Islands are composed of shield volcanoes, that have been built up from the sea floor. If measured from sea floor level, some of the Hawaiian volcanoes are the worlds largest mountains in terms of both height and volume (Comptons). In the 20th century, major flows occurred in 1920 and 1921, 1950, 1955, 1959, 1965, and 1969. The current eruption cycle, the longest-running in modern Hawaiian history, began on January 3, 1983 (Encarta).