Answer:
Minerals are defined as solid, inorganic, naturally occurring substances with a definite chemical formula and certain physical properties. Almost all chemical elements in the Earth's crust are associated with at least one mineral. Minerals are very important to mankind. Some are used as fuels, e.g. coal, natural gas and petroleum. They are also used in industries, e.g. Iron, gold, aluminium uranium, etc., in medicines, in fertilizers etc.
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