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
This Is What You Want... This Is What You Get This Is What You Want... This Is What You Get This Is What You Want... This Is What You Get is a 1984 album by Public Image Ltd. It is the band's fourth official studio album and includes the single "Bad Life" and a re-recorded version of a "This Is Not a Love Song", which had been a No. 5 UK and international hit when released as a single in 1983. An early version of the album was released in 1983 by founding PiL guitarist Keith Levene as "Commercial Zone". The album was then re-recorded after Levene's departure from the