A lava dome is a structure composed of extremely viscous lava (which flows slowly and with difficulty) with a typical dome shape.
They are formed because of the high viscosity of the lava, which comes out of the ground at relatively low temperatures (600-800 °C), and therefore much of the lava is already solidified and cannot flow. For this reason the domes are imposing structures, in which, unlike other lava forms, the height is almost equal to the distance travelled by the lava.
