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
What a Nightmare, Charlie Brown! What a Nightmare, Charlie Brown! What a Nightmare, Charlie Brown! is the 17th primetime animated TV special based upon the comic strip "Peanuts", created by Charles M. Schulz. It was originally aired on Thursday, February 23, 1978, at 8:00 P.M. ET/PT on CBS. The special is unusual in that Snoopy and Charlie Brown are the only members of the "Peanuts" cast to appear in it. The plot is similar to that of Jack London's "Call of the Wild". This was the first special Bill Melendez directed since 1973's "A Charlie Brown Thanksgiving". In June 2010, the special was released on