Heavy metals are the metallic elements with high atomic weights, such as, mercury Chromium cadmium, arsenic, and lead. Even at low levels these metals can damage living things. They do not break down or decompose and tend to build up in plants, animals, and people causing health concerns.
Other /More definition:
Heavy Metals are metals such as lead, chromium, copper, and cobalt that can be toxic at relatively low concentrations
List of books: Heavy,metals

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