Coal and Petroleum

Natural Fuels can be classified as

The useful substances that are obtained from petroleum are

Petroleum is formed at the bottom from the remains of a tiny organism

Coal, Petroleum and Natural gas are also called as

Petroleum is also known as

Shoe polish is made from

The slow process of conversion of vegetation to coal is called

In manufacturing of steel this is used

Petroleum is separated into various components by a technique called

Natural gas is trapped between