Basaltic. There is more gas content than in most basaltic magma so that when a cinder cone erupts, The pressure builds up and makes the eruption somewhat explosive. Tephra, or dried lava/magma, is shot up, and joined to the volcano making it larger.n Science. Cinder cone volcanoes are the most common type of volcanoes. They are characterized by steeply angled sides and a conical shape. They are relatively small in size and can rang … e from tens to hundreds of meters in height.