Sills, dykes, and batholiths are examples of intrusive volcanic landforms. Intrusive volcanic landforms are formed when magma solidifies beneath the Earth's surface. Sills are horizontal sheets of solidified magma that have intruded between layers of rock, while dykes are vertical or diagonal sheets of magma that have intruded through existing cracks in the rock. Batholiths are large masses of solidified magma that have pushed their way up into the Earth's crust, forming a dome-shaped structure. These intrusive volcanic landforms are typically made up of igneous rocks such as granite, gabbro, and diorite.