MAFIC

Describes magma that contains lower amounts of silica and is generally less viscous and less gas-rich than silicic magma. Tends to erupt effusively, as lava flows. Includes andesites (57-63 per cent SiO2), basaltic andesites (53-57 per cent SiO2), and basalts (47-53 per cent SiO2).