Petrology Petrology Petrology (from the Greek πέτρος, "pétros", "rock" and λόγος, "lógos", "subject matter", see -logy) is the branch of geology that studies rocks and the conditions under which they form. Petrology has three subdivisions: igneous, metamorphic, and sedimentary petrology. Igneous and metamorphic petrology are commonly taught together because they both contain heavy use of chemistry, chemical methods, and phase diagrams. Sedimentary petrology is, on the other hand, commonly taught together with stratigraphy because it deals with the processes that form sedimentary rock. Lithology was once approximately synonymous with petrography, but in current usage, lithology focuses on macroscopic hand-sample or outcrop-scale
What Love Is Made Of What Love Is Made Of "What Love Is Made Of" is a song recorded by British recording artist Katy B. Written by Katy alongside Goldon Warren, who also produced it under the name Geeneus, the track was released as a standalone single via digital retailers on 8 July 2013 by Rinse and Columbia Records. It was composed after Katy had been listening to dance genres. The theme conveyed in the lyrics is love while musically, the song has been described as a "trance-y" and "rave-y" dance song with its production containing synthesizers and piano. Katy later decided to not include