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
This Is What You Came For France, Hungary, Italy, the Netherlands, Norway, Portugal and Slovakia. The song has reached the top 10 in all except three of the countries it has charted in. Taylor Swift performed "This is What You Came For" on the piano for the first time live at the United States Grand Prix in Austin, Texas, on 22 October 2016. Swift then performed an acoustic guitar version at the DirecTV Super Saturday Night in Houston, Texas, on 4 February 2017. This Is What You Came For "This Is What You Came For" is a song by Scottish DJ and record producer Calvin Harris,