põlevkivil

Põlevkivil is a type of rock that is found in various regions of the world. It is also known as lignite, or brown coal, and is a soft, combustible sedimentary rock that is composed primarily of organic matter.

The composition of põlevkivil varies depending on the location where it is found. However, it generally consists of a mixture of water, carbon, and other elements, including oxygen, nitrogen, and sulfur. The rock is brownish-black in color and has a relatively low calorific value compared to other types of coal.

Põlevkivil is often associated with coal-forming environments, such as swamps and river deltas. It is formed when plant material, such as peat, is subjected to pressure and heat over millions of years. This process can occur at depths of up to several kilometers below the Earth's surface.

Põlevkivil has been used as a fuel source throughout history, with early uses dating back to ancient civilizations. However, its widespread use declined in the late 20th century as more efficient and cleaner energy sources became available. Today, põlevkivil is primarily used as a source of electricity in power plants, particularly in regions where other energy sources are scarce.

Some countries with significant põlevkivil reserves include Germany, Russia, and Australia. The environmental impact of põlevkivil mining and combustion is a topic of ongoing debate, with proponents arguing that it can provide a vital source of energy in rural or remote areas, while opponents raise concerns about air and water pollution.

The extraction and use of põlevkivil continues to be a contentious issue, with respective parties advocating for either increased regulation or greater access to the resource.