Fossil fuels consist of deposits of once living organisms. The organic matter takes centuries to form. Fossil fuels principally consist of carbon and hydrogen bonds. There are three types of fossil fuels which can all be used for energy provision; coal, oil and natural gas. Coal is a solid fossil fuel formed over millions of years by decay of land vegetation. When layers are compacted and heated over time, deposits are turned into coal.
extreme (comparative extremer or more extreme, superlative extremest or most extreme) 1  Of a place, the most remote, farthest or outermost. At the extreme edges, the coating is very thin.â. 2  In the greatest or highest degree; intense.
Definition of unbearable for English Language Learners. : too bad, harsh, or extreme to be accepted or endured : not bearable.