Factors that Affect the Shape & Pattern of Volcanoes by keypoint The nature of the vent-Is it linear or central vent? The type or nature of the lava -Is it a mobile or viscous lava? The character of the earth crust through which the lava escapes. Others are Viewing: The Shape of the Earth Classification of Volcanoes Distribution of Volcanoes Intrusive Vulcanicity Extrusive Vulcanicity Major Earthquakes of the World Effects of Earthquakes