1.5 learning from acid deposition

• fly ash: small particles of sand and other unburned material that remain suspended in he exhaust gases when pulverized coal is combusted
• electrostatic precipitator: a device that uses electric fields to collect fly ash from emissions
• scrubbing: a process used to remove one of more components from a mixture of gases by passing it through substances that absorb and separate unwanted components
• catalyst: a substance used in a chemical process that increases the speed of the reaction and is not affect by the process
• catalytic converter: an emission-control device used to remove NO, carbon monoxide and hydrocarbons from vehicle exhaust
• troposphere: the lowest region of the atmosphere that extends to approximately 18 km above earth's surface; the region of the atmosphere where all weather occurs
• photochemical smog: a brownish-red haze produced but the reaction of sunlight and the components in automobile exhaust
• volatile organic compound (VOC): a hydrocarbon or other organic molecule that vaporizes and exists as a gas in the air, sources include gasoline, solvents, paints, and other petroleum-based materials that vapourize.
• liming: adding a basic compound to soil or a body of water to neutralize acid deposition