A volcano is an opening in earth's crust though which molten rock, rock fragments and hot magma ( lava ) errupts. Most volcanoes explode and mountains doesn't. Most of the time,volcanoes have openings in the top. Mountain is an area of land that rises steeply from the land around it. Mountains does not produce lava. Both rises from earth surfaca, can have different types & shapes!
Hope I helped =)
Hope I helped =)