Geologists work in one of the most important (and oldest) Earth Sciences. Most people are aware that they study rocks in the environment. They also study rock formations and how they are created (for example, the rock layers of the Grand Canyon), what leads to rocks being created (most are compacted organic materials but some are inorganic, formed from volcanic activity) and the natural processes that shape our world. They may examine how natural processes affect rocks such as river formation, for example, and how natural environment is affected by rocks. Rocks can impact the PH level of soils and determine the plant and animal life that thrives there. Their aim is to understand the planet’s history and the chronology of individual rock formations. They study the materials of the Earth and the wild processes upon it.