introduction of chemical contaminants into a water body.

livestock food prepared by storing and fermenting green forage plants in a silo.

facility for cleaning and treating fresh water for drinking, or cleaning and treating wastewater before discharging into a water body.

physical, chemical, and biological processes used to remove pollutants from wastewater before discharging it into a water body.

any well (drinking water, oil and gas, etc.) which is not used for a long period of time, is not maintained properly, and/or is not properly sealed when its useful life is over.

the strength (concentration of hydrogen [H+] ions) of an acidic substance; measured as pH.

rain with a pH of less than 5.6; results from atmospheric moisture mixing with sulphur and nitrogen oxides emitted from burning fossil fuels or from volcanic activity; may cause damage to buildings, monuments, car finishes, crops, forests, wildlife habitats, and aquatic life.

force of attraction between two unlike materials.

the process of exposing to circulating air.

high altitude pictures taken from an aircraft or satellite.