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.

Most Searched in Computers and Internets Most Searched in Pregnancy and Parenting
Most Searched in Food and Drink Most Searched in Health
Nokia Lumia 820 vs HTC One X
Dell XPS 10 vs Sony Xperia Z Tab
Ceramic vs Tourmaline Hair Dryer