What is Coal?
Coal is a fossil fuel that is formed from the remains of plants that lived and died millions of years ago. Over time, the plant material was subjected to heat and pressure, which caused it to transform into coal.
Types of Coal
There are four main types of coal:
- Anthracite: This is the highest quality coal, known for its high carbon content and low impurities. It is often used for heating and in the steel-making process.
- Bituminous: This type of coal is widely used for electricity generation and in industrial processes. It has a higher heat content compared to lignite and subbituminous coal.
- Subbituminous: Subbituminous coal is used primarily for electricity generation and has a lower heat content than bituminous coal.
- Lignite: Lignite is the lowest quality coal, with high moisture content and low heat content. It is used mainly for electricity generation.
Formation of Coal
Coal is formed through a process called coalification. It begins with the accumulation of plant material in swamps and marshes. Over time, the plant material is buried by sediment and subjected to heat and pressure, which causes it to undergo physical and chemical changes, ultimately turning into coal.
Uses of Coal
Coal has several important uses, including:
- Electricity generation
- Steel production
- Heating and cooking
- Industrial processes
Environmental Impact
Burning coal releases carbon dioxide and other pollutants into the atmosphere, contributing to air and water pollution. The mining of coal can also have negative impacts on the environment, including habitat destruction and water contamination.
Study Guide
- What is the main process involved in the formation of coal?
- Compare and contrast the four main types of coal.
- What are the primary uses of coal?
- Discuss the environmental impact of coal mining and burning.
- Explain the role of coal in electricity generation.
