Question

what kind of materials are coal and lead

Answer 1

These minerals include sulfur, salts, limestone, clays, barite and industrial diamonds. Coal, copper, gold, gravel and iron ore are all mined, but are they all minerals? It's likely that the process that formed coal and other fossil fuels is still occurring in swampy areas where plant material accumulates.

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Answer 2

coal is exhaustable and lead is non renewable