Coal is a combustible black or brownish-black sedimentary rock that is composed mainly of carbon and hydrocarbons. It is formed from the remains of vegetation that have been compressed and heated over millions of years. Coal is one of the most widely used fossil fuels for generating electricity and heat, as well as for industrial processes.
There are four main types of coal, each with different carbon content and energy value:
Coal is formed from the remains of plants that lived and died millions of years ago. The process of coal formation starts with the accumulation of plant debris in swamps and peat bogs. Over time, the plant material is buried by sediment and subjected to heat and pressure, which leads to the formation of coal.
Coal has been used for various purposes throughout history. Some of its main uses include:
While coal has been a major source of energy for centuries, its use has significant environmental impacts. The combustion of coal releases carbon dioxide, sulfur dioxide, and other pollutants into the atmosphere, contributing to air pollution and climate change. The mining of coal can also lead to habitat destruction and water pollution.
These study guide questions can help you test your knowledge and understanding of the topic "coal." Feel free to explore further resources and conduct experiments to deepen your understanding of this important fossil fuel.