Elements emit colours when heated because electrons in atoms can have only certain allowed energies.Heating an atom excites its electrons and they jump to higher energy levels. When the electrons return to lower energy levels, they emit energy in the form of light. Every element has a different number of electrons and a different set of energy levels. Thus, each element emits its own set of colours. See, for example, mercury and neon above. Those colours are as distinctive to each element as fingerprints are to people.
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Catholicism cannot be seen as a single tradition, it is a part of a tradition.
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When competition for resources is unnecessary
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Farmers growing high-yield crops are more likely to be self-sufficient and thus require less support from the rest of society.
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