'Petrology' is the study of the origin, structure and composition of what?
Igneous petrology Igneous petrology Igneous petrology is the study of igneous rocks—those that are formed from magma. As a branch of geology, igneous petrology is closely related to volcanology, tectonophysics, and petrology in general. The modern study of igneous rocks utilizes a number of techniques, some of them developed in the fields of chemistry, physics, or other earth sciences. Petrography, crystallography, and isotopic studies are common methods used in igneous petrology. The composition of igneous rocks and minerals can be determined via a variety of methods of varying ease, cost, and complexity. The simplest method is observation of hand samples with the
Origin of the Moon that two bodies—each five times the size of Mars—collided, then re-collided, forming a large disc of debris that eventually formed Earth and the Moon. The paper was called “Forming a Moon with an Earth-like composition via a Giant Impact,” by R.M Canup. A 2012 study on the depletion of zinc isotopes on the Moon supported the giant-impact origin for Earth and the Moon. In 2013, a study was released that indicated that water in lunar magma is indistinguishable from carbonaceous chondrites and nearly the same as that of Earth in isotopic composition. The giant-impact hypothesis was again challenged in September