The study of the Earth and the solid and liquid materials it is made up of as well as the structure of these materials, are all, together termed as Geology. The study also consists of the history of these Earth materials, like, formation of volcanoes, rivers, mountains, rocks, glaciers, etc., the different processes that take place on them and the effect of these processes on human life. So, geology also consists of the study of living things/organisms that have inhabited the Earth. The main aim of geological research is the study of the history of planet Earth, along with the gradual changes in the Earth materials and living organisms, due to various processes that took place over vast time periods. The study of these geological processes help to foresee events that can happen in future due to these processes. The Earth processes that are studied in geology are: earthquakes, landslides, volcanoes, floods, etc. The study of these processes help in avoiding future casualties due to natural disasters, by taking proper preventive measures. The study of Earth materials, like, oil, minerals and metals help to find out the presence of these materials on Earth. And the study of history of Earth helps to understand the climate change of the Earth and how the present climate will influence the future climate. Geology is more like solving the puzzles of nature, of how and why the processes take place. Geology, if taken up as a career, promises a very bright future. Given below is an alphabetical glossary of all geological terms that are commonly used while studying geology.