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.

Most Searched in Food and Drink Most Searched in Sports
Most Searched in Cars and Transportation Most Searched in Electronics
Google+ Profile vs Google+ Page vs Google+ Local Q
Outsourcing vs Offshoring
Less Than vs Fewer Than
Passive Voice vs Active Voice