Above: Graph illustrating the difference in average chemical compositions between lava erupted by Hawaiian volcanoes and by Mount St. Helens in 1980. The number given for each chemical element gives the amount (in weight percent) of that element (expressed as oxide) contained in the lava. Left: Note the contrast in color and texture between Hawaiian basalt (dark) and Mount St. Helens dacite (light). (Photograph by J.D. Griggs).

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