The cone-shaped structure, or edifice, of the volcano is formed by the symmetrical buildup of lava and/or pyroclastic substance around the central vent system. The central vent is deep connected to a magma chamber, which serves as the primary storage area for eruptive material.
The third type of volcano, shield volcanoes, are almost entirely composed of fluid lava flows. Stream after stream spills out in all ways from a central summit exhaust, or group of vents, forming a broad, gently sloping cone with a profile similar to that of a warrior's shield.
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