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A spatter cone is formed of molten lava ejected from a vent of a volcano. Expanding gases in the lava fountains tear the liquid rock into irregular gobs that fall back to earth, forming a heap around the vent. The partly liquid rock splashes down and over the sides of the developing mound is called spatter. Because spatter is not fully solid when it lands, the individual deposits are irregular in shape and weld together as they cool, and in this way differ from cinder and ash. A cinder cone is a volcanic cone built almost entirely of loose volcanic fragments called cinders. They are built from particles and blobs of congealed lava ejected from a single vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone. Most cinder cones have a bowl-shaped crater at the summit.

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17y ago

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