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A volcano is a vent, or opening, in Earthâs surface through which molten rock, gases, and ash erupt. The word also refers to the form or structure, usually conical, produced by accumulations of erupted material.
1 Volcanoes are big holes that let out hot gasses, ash and magma from deep inside the Earth. 2  Many volcanoes are mountains, made up of layers of lava and ash. 3  Many volcanoes have several vents â a main one, and secondary ones that branch off the main vent. The largest active volcano is Mauna Loa. 2  Most volcanoes can be found in countries that have coastlines on the Pacific Ocean â this is called the Ring of Fire. 3  Gas, ash and magma can come out of volcanoes. 4  When magma flows out of a volcano, itâs called lava.