Petrology and cycles and the use of thermodynamic data and experiments in order to better understand the origins of rocks. There are three branches of petrology, corresponding to the three types of rocks: igneous, metamorphic, and sedimentary, and another dealing with experimental techniques: 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
What of the Mormons? the United States. Beginning in 1969, the LDS Church began publishing the historical part of "What of the Mormons?" under the title "Truth Restored". Hinckley went on to become an apostle in the church and was the President of the Church from 1995 until his death in 2008. What of the Mormons? What of the Mormons?: A Brief Study of the Church of Jesus Christ of Latter-day Saints is a 1947 book by Gordon B. Hinckley that was published by The Church of Jesus Christ of Latter-day Saints (LDS Church). Portions of the book continue to be published by the