based on the symptoms present. The ability to. distinguish between a symptom and a cause. can speed the process up considerably. The tabulation above lists a few of the âmost. likelyâ symptoms and causes of pump failure or. less than expected performance.
Definition of PETROLOGY. : a science that deals with the origin, history, occurrence, structure, chemical composition, and classification of rocks. â petÂ·roÂ·logÂ·ic \Ëpe-trÉ-Ëlae-ËlÃ¤\ jik orÂ·petÂ·roÂ·logÂ·i \-cal-ji\ kÉl. adjective
gneiss (nÄ«s), coarse-grained, imperfectly foliated, or layered, metamorphic rock rock, aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided, according to their origin, into three major classesâigneous, sedimentary, and metamorphic.