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A volcano is a vent, or opening, in Earthâs surface through which molten rock, gases, and ash erupt. The word also refers to the form or structure, usually conical, produced by accumulations of erupted material.
Apart from cosmic radiation, spontaneous fission is the only natural source of neutrons (n). 1  A common. source of neutrons is the nuclear reactor, in which the splitting of a uranium or plutonium nucleus is. accompanied by the emission of neutrons. The neutrons emitted from one fission event can strike the.