Each coal ball is a mass of

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(D) Coal balls are petrified plant materials found in coal seams.They are primarily composed of mineral matter,specifically $CaCO_3$ (calcium carbonat

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All the above

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(D) Coal balls are petrified plant materials found in coal seams.They are primarily composed of mineral matter,specifically $CaCO_3$ (calcium carbonate),$MgCO_3$ (magnesium carbonate),and $FeS_2$ (iron sulphide).These minerals infiltrate the plant tissues,preserving them in a fossilized state.Therefore,all the listed substances are components of coal balls.

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