Hazardous waste A potentially dangerous substance that has been discarded, abandoned, neglected, released or designated as a waste material, or one that may interact with other substances to pose a threat. The branch of environmental chemistry that deals with chemical phenomena in water. The branch of science dealing with characteristics of freshwater, including biological properties as well as chemical and physical properties. Oceanography The science of the ocean and its physical and chemical characteristics. Eutrophication Relatively high productivity is required for the support of fish.
Excessive productivity can result in choking by weeds and can cause odor problems.
The growth of algae may become quite high in very productive water, with the result that the concurrent decomposition of dead algae reduces oxygen levels in the water to very low values. Frequently the key substance in determining the extent and kinds of life in a body of water. Another important water-quality parameter. It refers to the amount of oxygen utilized when the organic matter in a given volume of water is degraded biologically. Colloidal-sized particles in the atmosphere formed by grinding up bulk matter .