The large hole at the top of a volcano formed when the roof of a volcano's magmachamber collapses.
A steep, cone-shaped hill or small mountain made of volcanic ash, cinders, and bombs piled up around a volcano's opening.
A tall, cone-shaped mountain in which layers of lava alternate with layers of ash and other volcanic materials.
A wide, gentle sloping mountain made of layers of lava and formed by quiet eruptions.
A deposit of hardened magma in a volcano's pipe.
A slab of volcanic rock formed when magma forces itself across rock layers.
A slab of volcanic rock formed when magma squeezes between layers of rock.
A mass of rock formed when a large body of magma cools inside the crust.