Coal the heat and pressure of deep burial causes the loss of water, methane and carbon dioxide and an increase in the proportion of carbon. Thus first lignite (also called "brown coal"), then sub-bituminous coal, bituminous coal, and lastly anthracite (also called "hard coal" or "black coal") may be formed. The wide, shallow seas of the Carboniferous Period provided ideal conditions for coal formation, although coal is known from most geological periods. The exception is the coal gap in the Permian–Triassic extinction event, where coal is rare. Coal is known from Precambrian strata, which predate land plants—this coal is presumed to
Peace of Mind/The Candle Burns ad campaign, it could be just what would be expected in the trash at Apple Records: a rejected demo from one of countless hopeful bands, whose members abandoned their musical aspirations long before the track became public. Peace of Mind/The Candle Burns "Peace of Mind" (also known as "The Candle Burns") is the name given to a song of unknown origin that was attributed to The Beatles on bootleg albums starting in 1973. The recording has the sound quality of a home-produced demo, and was reportedly recovered from a trash container at Apple Corps headquarters in 1970. As no copyright,