calderas - a large volcanic crater, especially one formed by a major eruption leading to the collapse of the mouth of the volcano., fissure vent - a linear volcanic vent through which lava erupts, usually without any explosive activity, maars - a broad, shallow crater, typically filled by a lake, formed by a volcanic eruption with little lava, volcanic field - A volcanic field is an area of Earth's crust that is prone to localized volcanic activity, volcanic plug - a volcanic object created when magma hardens within a vent on an active volcano,

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