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 is this Feeling? and new?/I felt the moment I laid eyes on you/My pulse is rushing/My head is reeling/My face is flushing/What is this feeling?/Fervid as a flame/Does it have a name?"). The irony comes in when phrases traditionally used for love songs are revealed to be expressing hate. When Galinda and Elphaba describe each other, Galinda complains about Elphaba being "utterly impossible to describe", while Elphaba simply calls Galinda "blonde". At the end of the song, Elphaba scares Galinda, by saying "Boo", with Galinda letting out a high-pitched squeal. What is this Feeling? "What is this Feeling?" is a song from the