4. composed of silica and oxygen. 1. ionic 2. Van der Waals 3. covalent 4. 1. quartz 2. 1. igneous 2.
Mafic rocks contain more silica than felsic rocks.
Mafic rocks are less dense than felsic rocks. Mafic rocks are lighter in color than felsic rocks. Mafic rocks contain more iron and magnesium than felsic rocks. The minerals in granite have a higher melting temperature, so they solidify deeper within the earth. 2.water content and silica content increase.