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Shield volcanoes, the third type of volcano, are built almost entirely of fluid lava flows. Flow after flow pours out in all directions from a central summit vent, or group of vents, building a broad, gently sloping cone of flat, domical shape, with a profile much like that of a warrior's shield.
Itâs there that the liquid rock waits to find a way through to the surface, causing a volcanic eruption. In most cases, the crater is usually closed after the eruption by cold, hard lava. Thrihnukagigur volcano is a rare exception to this, because the magma in the chamber seems to have disappeared.