Answer: Felsic (or silicic) magmas tend to increase the explosive potential of a magma body beneath a volcano by the greatest amount. This is because felsic magmas are high in silica content, which makes them more viscous and more likely to trap gases within the magma chamber. As pressure builds up, the gases can become trapped and reach high pressures, leading to a more explosive eruption. In contrast, mafic magmas are lower in silica content and are typically less viscous, which allows gases to escape more easily and results in less explosive eruptions.
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