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 Is Love An official music video was released directed by Soulvizion. It features the Dutch professional basketball player Don Rigters who plays the role of David Rose, a basketball player who is severely injured trying to make a comeback to the game with encouragement from his girlfriend, (played by Melissa Kanza), his three teammates, (Alkenah Wansing, Jeroen Jansen and Lindy Chippendel) and by his basketball coach (played by J E Rigters). What Is Love "What Is Love" is a song recorded by Trinidadian-German Eurodance artist Haddaway for his debut album, "The Album". The song is recognizable by its refrain "What is love?