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
Is This Goodbye, Charlie Brown? calls him, Charlie Brown is so tired that he does not seem to be listening to what Peppermint Patty is saying. Patty invites him on a date to the movies, but makes it seem as if Charlie Brown is asking her instead. She says she would go with him to a movie, then hangs up, and goes to sleep feeling good about herself. Charlie Brown then suddenly wakes up and wonders what he was doing by the phone, thinking he just dreamt he was talking to Peppermint Patty. The next day, Peppermint Patty is waiting for Charlie Brown to pick