Here's why:
* Silica (SiO2) is a major component of magma and lava.
* Felsic refers to igneous rocks rich in feldspar and quartz, which are both high in silica.
* Mafic refers to igneous rocks rich in magnesium and iron, which are relatively low in silica.
Volcanoes with high silica content (felsic volcanoes) are characterized by:
* Explosive eruptions: Silica-rich magma is thick and viscous, trapping gases and building up pressure. This leads to powerful, explosive eruptions.
* High viscosity: The high silica content makes the magma very thick and sticky, resulting in slower lava flows.
* Light-colored rocks: The high silica content gives felsic rocks a light color, often gray, pink, or white.
* Formation of rhyolite and dacite: These are common rock types produced by felsic volcanoes.
Examples of felsic volcanoes include:
* Mount St. Helens (USA)
* Mount Vesuvius (Italy)
* Yellowstone Caldera (USA)
Note: The silica content of magma can vary, and some volcanoes can have a mixture of felsic and mafic characteristics.
