Viscous andesitic and rhyolitic magma have higher silica and dissolved-gas contents, and erupt at lower temperatures than basaltic magma.

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Viscous andesitic and rhyolitic magmas have higher silica content, which increases viscosity and gas content, and they erupt at lower temperatures compared to basaltic magma, which has lower silica content and erupts at higher temperatures.

Viscous Andesitic and Rhyolitic Magma Have Higher Silica and Dissolved-Gas