Metamorphic rock Metamorphic rock Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure ( or more), causing profound physical or chemical change. The protolith may be a sedimentary, igneous, or existing metamorphic rock. Metamorphic rocks make up a large part of the Earth's crust and form 12% of the Earth's land surface. They are classified by texture and by chemical and mineral assemblage (metamorphic facies). They may be formed simply by being deep beneath
Second Heat and cited as the "most memorable thing about this album" the cover of Judas Priest's "Heart of a Lion", "apparently given to the band by Halford without Downings's or Tipton's knowledge." In 2005, "Second Heat" was ranked No. 480 in "Rock Hard" magazine's book of "The 500 Greatest Rock & Metal Albums of All Time". Second Heat Second Heat is the second studio album by the American heavy metal band Racer X, released on February 11, 1987 through Shrapnel Records. In a contemporary review, "Rock Hard" defines "Second Heat" "a thoroughly convincing piece of work, which can also boast an