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
Highest Hopes: The Best of Nightwish Highest Hopes: The Best of Nightwish Highest Hopes: The Best of Nightwish is the third compilation album by Finnish symphonic metal band Nightwish. Their first, "Tales from the Elvenpath", was considered incomplete by many fans as it contains only tracks from "Oceanborn", "Over the Hills and Far Away", "Wishmaster" and "Century Child", leaving out "Angels Fall First". This compilation, though, contains songs from all previously released Nightwish albums, plus a live cover of Pink Floyd's "High Hopes". "Highest Hopes" was released in three different formats: Standard, Special Edition and Extended 2 CD. In addition to the normal version, a special