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
That's What Love Is For of Amy. One where she is in a giant, tall green dress. Another shot shows a black & white close up of Amy in a very retro-mod hair style. Remixes (feat. Chris Cox) – EP U.S. Promotional A&M CD Single U.S. Myrrh promotional CD single U.K. retail single That's What Love Is For "That's What Love Is For" is a 1991 Billboard Adult Contemporary chart #1 hit single and a Billboard Hot 100 top 10 single by Christian music singer Amy Grant. It was the third pop single off her 5x platinum selling album Heart in Motion and the only