Cinder cones<span> are the simplest type of volcano. 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 </span>cinders<span> around the vent to </span>form<span> a circular or oval </span>cone<span>.</span>
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