What Are Some Ways to Prevent the Spread of COVID-19?
Good web design has visual weight, is optimized for various devices, and has content that is prioritized for the medium.…
Good web design has visual weight, is optimized for various devices, and has content that is prioritized for the medium.…
Water scarcity, insufficient freshwater resources to meet the human and environmental demands of a given area. Water scarcity is inextricably linked to human…
Glacier, any large mass of perennial ice that originates on land by the recrystallization of snow or other forms of solid precipitation and that shows evidence of past…
Lead poisoning, also called plumbism, deleterious effect of a gradual accumulation of lead in body tissues, as a result of repeated exposure to lead-containing substances.…
Chlorine (Cl), chemical element, the second lightest member of the halogen elements, or Group 17 (Group VIIa) of the periodic table. Chlorine is…
Germ theory, in medicine, the theory that certain diseases are caused by the invasion of the body by microorganisms, organisms too…
Water purification, process by which undesired chemical compounds, organic and inorganic materials, and biological contaminants are removed from water. That process also…
Cast iron, an alloy of iron that contains 2 to 4 percent carbon, along with varying amounts of silicon and manganese and traces of impurities such as sulfur and phosphorus.…
Reservoir, an open-air storage area (usually formed by masonry or earthwork) where water is collected and kept in quantity so…
Sewer, conduit that carries wastewater from its source to a point of treatment and disposal. The wastewater may be domestic (sanitary) sewage, industrial sewage,…
Aqueduct, (from Latin aqua + ducere, “to lead water”), conduit built to convey water. In a restricted sense, aqueducts are structures used to conduct a water…
Water cycle, also called hydrologic cycle, cycle that involves the continuous circulation of water in the Earth-atmosphere system. Of the many…