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This Concept Map, created with IHMC CmapTools, has information related to: Chapter 5 Volcanoes Section 1, the most common type and are characterized by huge amounts of calmly flowing lava, openings in the Earth's surface through which Gases, nonexplosive eruptions which are the most common type, lava which can be Pillow Lava, Volcanoes consist of magma chamber, vents or openings in the Earth's surface, Explosive Eruptions caused by Silica Content of the Magma, lava which can be Blocky Lava, magma chamber which holds the lava, damage and spew Pyroclastic Material, lava which can be Aa, Pyroclastic Material which is volcanic Ash, Explosive Eruptions which are rarer than nonexplosive eruptions, Magma pass in nonexplosive eruptions, Volcanoes are openings in the Earth's surface, Pyroclastic Material which is Lapilli, lava which can be Pahoehoe, Magma pass in Explosive Eruptions, Pyroclastic Material which is Volcanic Bombs, Volcanoes consist of vents