Petroleum and its formation

Petroleum is derived from latin word Patra meaning rock and Oleum meaning oil . It is found deep inside the earth between layer of porous and nonporous rocks it is mixed with salt and water and the clothes over Water which has seeped through the porous rocks Alia of natural gases is associated with petroleum and its pressure holds the layer of Petroleum believe in position since petroleum and natural gas are both lighter than water therefore they occur above water ,
            Petroleum is a dark , viscous,fluorescent and oily liquid with an unpleasant odour, . It consists of a mixture of Hydrocarbons and cannot be used for any purpose so it is known as CURDE OIL.  Since it is a versatile source of energy and important for the economy of the country it is also known as Black gold the chemical compounds that originate from petroleum are known as petrochemicals these compounds maybe derived from other sources such as coal or natural gas . They are used in the manufacture of plastic detergents and synthetic fibres.