(A) The naturally occurring chemical substances in the earth's crust are minerals. Ores are minerals from which metals can be extracted conveniently a

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(A) The naturally occurring chemical substances in the earth's crust are minerals. Ores are minerals from which metals can be extracted conveniently and profitably. Ores are usually associated with earthy or undesired materials such as sand,stones,etc.,which are collectively known as $Gangue$.