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Students are given major-element, whole-rock chemical analyses from ten samples of lava from the 1868 eruption of Mauna Loa. They do not know sequence of eruption, only that the lavas came from the same volcano. Students are asked to evaluate the hypothesis that the observed chemical variation is due to the fractional crystallization of olivine. The hypothesis can be tested any of a number of graphs. Several examples are given in the accompanying Excel workbook.
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