What type of magma is rich in silica? More than 63% of silica is present in felsic and silicic magmas. Magmas made up of rhyolite and dacite are among them. These magmas are extremely viscous due to ...

Lava domes are rounded, steep-sided mounds built by magma that is highly resistant to flow, usually either dacite or rhyolite. Such magmas are typically too viscous to move far from the vent ...