highest part of a volcano - summit, side part of a volcano - slope, lowest part or ground part of a volcano - base, funnel-shaped opening at the top of a volcano. It is usually found inside the caldera. - crater, Larger than a crater. It is formed when part of the wall collapses following an explosive eruption. - caldera, another name for a cloud of ash, lava fragments carried through the air, and vapor - pyroclastic materials, the hot and liquid molten rock, under the earth's surface - magma, the molten rock that has been expelled from the interior of the earth's surface   - lava,

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