How are igneous rocks classified according to composition ?
Mafic and Silicic Magmas Although compositions cover a wide spectrum, most magmas contain 40 to 75 wt% SiO₂ (Box a). Magmas richest in SiO₂ also ten…
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What are the igneous rocks that form from magma known as ?
Igneous rocks and minerals form from magmas , molten rock that originates beneath Earth’s surface. Magma often collects in large magma chambers, but …