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The more mafic mineral, the more fluent the magma. In other words, basalt-rich magma is more flowing and felsic-rich magma is more viscous. So, the mafic composition increase the flow of magma. Example: balsalt-islands of Hawaii, very flowing, spreads readily. St. Elens Montain rich in andesite, which is a less mafic rock, is more viscous;thus, more explosive.

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15y ago

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