crocus bag coal hard rock burned solid fossil fuel which mostly carbon but has hydrogen sulphur oxygen and nitrogen

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Crocus bag of coal, a hard rock burned as solid fossil fuel which is mostly carbon but has hydrogen, sulphur, oxygen and nitrogen. Royalty Free Stock Photo
Crocus bag of coal, a hard rock burned as solid fossil fuel which is mostly carbon but has hydrogen, sulphur, oxygen and nitrogen. Royalty Free Stock Photo
   
   
   
   
   
Crocus bag of coal, a hard rock burned as solid fossil fuel which is mostly carbon but has hydrogen, sulphur, oxygen and nitrogen.
   
   
   
   
   
   
   
Crocus bag of coal, a hard rock burned as solid fossil fuel which is mostly carbon but has hydrogen, sulphur, oxygen and nitrogen. It is a sedimentary rock formed from peat, by the pressure of rocks.

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