Cinder Cones, sometimes called Scoria cones, are the most common type of volcano. Cinder cones are the smallest type of volcano. They are circular or oval shaped and their crater is bowl shaped. These volcanoes grow very fast until they reach their maximum height. Cinder cone volcanoes form from small, jagged pieces of rock and ash, also known as cinders, thrown in the air during an explosion. An example of a cinder cone volcano is in Mexico, called the Paricutin. It started growing in 1943, and in just five days, the volcano had grown to 300 feet!