Rhyolitic lava is a type of volcanic rock that is high in silica, typically containing over 70% silica content. This high silica level makes the lava very thick and viscous, which means it doesn't flow easily. As a result, rhyolitic lava often forms steep-sided volcanoes, known as domes, rather than spreading out over large areas like other types of lava. When rhyolitic lava erupts, it can create explosive volcanic eruptions due to the buildup of gas within the thick lava. These eruptions can produce pyroclastic flows, which are fast-moving currents of hot gas and volcanic matter. Rhyolitic lava is commonly found in areas with continental crust, such as the Yellowstone Caldera.