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
The Study of Touch jazz piano trio in the 21st century". Writing for The Guardian reviewer John Fordham called it "A session by a master improvising composer, and in ideal company". On All About Jazz, Mike Jurkovic noted "With boundless humor and flexible grace, pianist Django Bates offers us "The Study of Touch" the perfect piano trio music for the significant other who absolutely hates piano trio music" while Karl Ackermann said "it seems that in teaming with Eldh and Bruun, more than ten years back, Bates was simultaneously laying the groundwork for what has become his own version of a standards trio. In