Science Give the definition [1 M]

Petroleum refinery is a place where the process of separating the various constituents of petroleum is carried out.

It is a dark oily liquid with an unpleasant odour. It is a source of petrol and diesel.

Natural Gas is a very important fossil fuel. It is a cleaner fuel.

Dead remains of living organisms and buried over millions of years, like coal, petroleum and natural gas are fossil fuels.

It is tough, porous and black substance obtained by the processing of coal.

It is a black thick liquid with an unpleasant smell obtained by the processing of coal.

Coal gas is obtained as a by-product during the processing of coal to form coke, and is used as a fuel.

Coal is a fossil fuel, formed by the decay of vegetation which existed millions of years ago.

The process of separating the different constituents/fractions of petroleum is known as petroleum refining.

The process of heating coal in the absence of air is called destructive distillation.

The slow process of conversion of dead vegetations into coal is called carbonisation.

The remains of the part of plants or animals transformed over time, is called fossil.

The resources, that are present in limited quantity in nature, and can be exhausted by human activities, for example, coal, petroleum, minerals, forests etc.

The resources, that are present in unlimited quantity in nature, and cannot be exhausted by human activities, for example, air, sunlight etc.

The resources, that are obtained from nature are called natural resources, for example, air, water, soil and minerals.