5. Describe the three types of magma. Include the silica content and explosivity

Basaltic magma - - SiO2 45-55 wt%, high in Fe, Mg, Ca, low in K, Na

Andesitic magma - - SiO2 55-65 wt%, intermediate. in Fe, Mg, Ca, Na, K

Rhyolitic magma - - SiO2 65-75%, low in Fe, Mg, Ca, high in K, Na