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
White Light/White Heat U.S. "White Light/White Heat" contains distorted, feedback-driven, and roughly recorded sound, which is regarded as influential. British rock band Buzzcocks were formed by Pete Shelley and Howard Devoto out of a shared interest in "Sister Ray". White Light/White Heat White Light/White Heat is the second studio album by American rock band the Velvet Underground, released in 1968 by record label Verve. It was the band's last studio recording of new material with bassist and founding member John Cale. After the disappointing sales of the Velvet Underground's first album, "The Velvet Underground & Nico" (1967), the band's relationship with Andy Warhol