Coal

Different Types of Rocks

Different Types of Rocks
Rock is a solid material composed of grains of minerals. There are many different types of rocks. However, broadly they are divided into three categories – Igneous rocks, sedimentary rocks and metamorphic...

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.

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