Limnology Limnology Limnology ( ; from Greek λίμνη, "limne", "lake" and λόγος, "logos", "knowledge"), is the study of inland aquatic ecosystems. The study of limnology includes aspects of the biological, chemical, physical, and geological characteristics and functions of inland waters (running and standing waters, fresh and saline, natural or man-made). This includes the study of lakes, reservoirs, ponds, rivers, springs, streams, wetlands, and groundwater. A more recent sub-discipline of limnology, termed landscape limnology, studies, manages, and seeks to conserve these ecosystems using a landscape perspective, by explicitly examining connections between an aquatic ecosystem and its watershed. Recently, the need to understand
The Secret of Divine Civilization societies need, and that certain valuable subjects are neglected in the process. His counsel on this is that "the individual should, prior to engaging in the study of any subject, ask himself what its uses are and what fruit and result will derive from it. If it is a useful branch of knowledge, that is, if society will gain important benefits from it, then he should certainly pursue it with all his heart." The Secret of Divine Civilization The Secret of Divine Civilization is a book written anonymously by `Abdu'l-Bahá in 1875, addressed to the rulers and the people of