acid rain


acid rain

noun

: rain that contains dangerous chemicals because of smoke from cars and factories

Full Definition of ACID RAIN

:  acid precipitation in the form of rain

Examples of ACID RAIN

  1. trees damaged by acid rain

First Known Use of ACID RAIN

1845

acid rain

noun    (Medical Dictionary)

Medical Definition of ACID RAIN

: acid precipitation especially in the form of rain

acid rain

noun    (Concise Encyclopedia)

Any precipitation, including snow, that contains a heavy concentration of sulfuric and nitric acids. This form of pollution is a serious environmental problem in the large urban and industrial areas of North America, Europe, and Asia. Automobiles, certain industrial operations, and electric power plants that burn fossil fuels emit the gases sulfur dioxide and nitrogen oxide into the atmosphere, where they combine with water vapour in clouds to form sulfuric and nitric acids. The highly acidic precipitation from these clouds may contaminate lakes and streams, damaging fish and other aquatic species; damage vegetation, including agricultural crops and trees; and corrode the outsides of buildings and other structures (historic monuments are especially vulnerable). Though usually most severe around large urban and industrial areas, acid precipitation may also occur at great distances from the source of the pollutants.

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