Generally, these rocks (granite and rhyolite) are light in color, and their density is relatively low. The feldspar predominates in intermediate rocks, which have a slight silica content. Magma ...

Lava flows are masses of magma that pour onto the Earth's surface ... called alkaline lava, has an extremely low viscosity, making it almost as fluid as water. Alkaline lava has a melting ...

The mélange rises as diapirs into the overlying hot mantle wedge due to its buoyancy and low ... viscosity, which then melts along with the surrounding mantle rocks and eventually forms the arc ...