Water scarcity, insufficient freshwater resources to meet the human and environmental demands of a given area. Water…

Glacier, any large mass of perennial ice that originates on land by the recrystallization of snow or other forms of solid precipitation and…

Lead poisoning, also called plumbism, deleterious effect of a gradual accumulation of lead in body tissues, as a result of…

Chlorine (Cl), chemical element, the second lightest member of the halogen elements, or Group 17 (Group VIIa)…

Germ theory, in medicine, the theory that certain diseases are caused by the invasion of the…

Water purification, process by which undesired chemical compounds, organic and inorganic materials, and biological contaminants are…

Reservoir, an open-air storage area (usually formed by masonry or earthwork) where water is collected…

Sewer, conduit that carries wastewater from its source to a point of treatment and disposal. The wastewater may be…

Aqueduct, (from Latin aqua + ducere, “to lead water”), conduit built to convey water. In a restricted sense, aqueducts are structures…