Definition of Geology
Geology is the study of the Earth, the materials of which it is made, the structure of these materials, and also the processes acting upon them. It includes the analysis of organisms that have inhabited the world. An significant part geology is the study of how Earth's materials, structures, procedures and organisms have changed over time.

Geological development of an area
The geology of an area changes through the years as rock units are deposited and inserted, and deformational processes change their shapes and locations. Deposition can occur when sediments settle on the surface of the planet and afterwards lithify into sedimentary rock, or when as volcanic substance such as volcanic lava or ash flows quilt the surface. Igneous intrusions like batholiths, laccoliths, dikes, and sills, push upwards into the overlying rock, and crystallize because they intrude. After the initial sequence of rocks has been deposited, the stone units could be deformed and/or metamorphosed. Deformation typically occurs as a consequence of horizontal shortening, horizontal extension, or side-to-side (strike-slip) movement.

History of Geology
The study of the physical material of the Earth dates back to ancient Greece when Theophrastus (372--287 BCE) composed the work Peri Lithon (About Stones). During the period, Pliny the Elder wrote in detail of the many metals and minerals then in practical use -- correctly noting the source of amber.

What Does a Geologist Do?
Geologists work to understand the history of the planet. The better they can comprehend Earth's history, the greater they could foresee how events and processes of the past could influence the future.

Geology as a Career
Geology could be a rather interesting and rewarding career. The minimum training required is a four-year college degree in geology. Pre-college students that are thinking about becoming geologists should have a full curriculum of college preparatory classes, particularly those in math, science, and writing. Courses related to computers, geography and communication can also be valuable. Geologists work in a variety of settings. These include: natural resource companies, environmental consulting companies, government agencies, non-profit organizations, and universities. Most geologists do field work at least part of the time. Other people invest their time in laboratories, offices or classrooms. All geologists prepare accounts, do calculations and utilize computers.

Although a bachelor's degree is required for entry-level employment, many geologists make master's and/or doctorate degrees. The advanced degrees offer a higher level of training, often at a geology specialty area like paleontology, mineralogy, hydrology, or volcanology. Advanced degrees will often qualify the geologist for supervisory positions, research missions, or teaching positions at the college level. Th...

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