What is coal??

coal

Coal is a fossil fuel.
   Coal is a combustible sedimentary rock, formed from the organic sediment, which originated from the remains of plants and has developed through geological time. Elements consisting of carbon, hydrogen and oxygen.
Coal is also an organic rock that has the properties of the complex physics and chemistry.
    empirical formula such as C137H97O9NS to C240H90O4NS bitumen and anthracite for.
Coal formation requires certain conditions and only occur in a particular era in the history of geology. Carboniferous Period, roughly 340 million years ago, is the formation of the most productive coal and almost all coal mines (coal black) who live in the northern hemisphere is formed.
In the Permian Period, about 270 Mya, is also an economical form of coal deposits in the southern hemisphere, like Australia, and continues until the Tertiary Period (70-13 Mya) in the other hemisphere.
Almost all coal-forming plant origin.
Coal mining coal mining from the earth for human use in many coal mines in Indonesia and even the world.
Coal used as fuel, can also be used to make coke for the manufacture of many more baja.dan their role, there are many coal mines in Indonesia, especially in Kalimantan