A dome mountain is a type of mountain that is characterized by its rounded shape, similar to a dome. This type of mountain is formed when molten rock rises from the Earth's mantle, but does not break through the Earth's crust. Instead, the rock cools and hardens, forming a large, rounded feature. Synonyms for dome mountain include shield volcano, stock, and laccolith. A shield volcano is a broad, gentle-sloping volcano with a flattened dome shape, formed by the accumulation of lava flows. A stock is a small, intrusive igneous body that is similar to a laccolith, which is a type of dome-shaped intrusion of igneous rock that has been pushed up into the overlying rock layers.