Anthracite

Different Types of Coal

Different Types of Coal
Coal is a combustible organic rock which is primarily made of carbon, nitrogen and oxygen. It is mainly classified into different ranks or grades, based on the percentage of carbon in it.

Top 10 Most Searched Differences Most Searched in Games and Recreation
Most Searched in Beauty and Style Most Searched in Cars and Transportation
Smartphone vs Regular Phone
Love vs Marriage
Physician vs Surgeon
Police vs Cop