Geology is a career that offers many different options. A geologist can focus on areas such as rocks, land formations, water and many more. This geologist works in hydrogeology - or the study of water...specifically, groundwater. Groundwater is deep beneath the surface of the land. Water doesn't flow like a river beneath the surface. It simply means that all of the rocks and soil at the groundwater level are totally saturated with water. It's the job of this geologist to study that groundwater. By studying it, he can help decide good locations for building and farming. He can determine if harmful chemicals have influenced the quality of groundwater.