What is formed when magma begins to form a dome shape which will push outward in a hill formation?

When magma begins to form a dome shape and pushes outward, it creates a volcanic dome, also known as a lava dome. This geological feature is formed from the slow extrusion of viscous lava, which accumulates near the vent and gradually builds up into a steep-sided, convex hill. Volcanic domes can grow over time and may become unstable, leading to potential eruptions or collapses. They are commonly found in the vicinity of stratovolcanoes and can vary in size and shape.