Coal services refer to a range of activities related to the mining, processing, transportation, and use of coal. These services include exploration and development of new coal deposits, coal mining and processing, transportation of coal by rail, truck, or ship, and the construction and operation of coal-fired power plants. Coal services also include environmental and safety services, such as mine reclamation, land restoration, and the development of technologies to reduce the environmental impact of coal. In addition, coal services include marketing and trading of coal, which involves buying and selling coal for various purposes, such as electricity generation, steel production, and cement manufacturing.


Chemical services refer to a broad range of activities related to the production, distribution, and use of chemicals. These services include research and development of new chemicals and materials, manufacturing and processing of chemicals, transportation and logistics of chemicals, and storage and handling of chemicals. Chemical services also include technical and consulting services, such as safety and environmental consulting, as well as marketing and sales of chemical products. The chemical industry plays a vital role in many sectors of the economy, including agriculture, construction, electronics, healthcare, and transportation. However, the production and use of chemicals also have significant environmental and health impacts, 


Petroleum services refer to a wide range of activities related to the exploration, production, transportation, and refining of crude oil and natural gas. These services include geophysical surveys, drilling and well completion, extraction and production of crude oil and natural gas, transportation of petroleum products by pipelines, tankers, and trucks, and refining of crude oil into various products, such as gasoline, diesel fuel, and lubricants. Petroleum services also include marketing and trading of petroleum products, such as crude oil, gasoline, and natural gas, and the development and deployment of new technologies to enhance efficiency and reduce environmental impacts. The petroleum industry plays a critical role in the global economy, providing a significant share of the world’s energy supply and supporting many other industries, such as transportation, chemicals, and plastics.