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Sulfur oxides and nitrogen oxides, emitted by burning fossil fuels, enter the atmosphere-- where they mix with oxygen and water to form sulfuric acid and nitric acid-- and return to Earth's surface.
Conversion of sulfur oxides and nitrogen oxides to acids that return to Earth as rain snow or fog
Acitve Solar Energy Systems
Solar energy system that collects energy through the use of of mechanical devices like photovoltaic cells or flat-plate collectors
Commercial agriculture characterized by integration of different steps in the food-proccessing industry, usually through the ownership by large corporations.
The ratio of the number of farmers to the total amount of land suitable for agriculture
The time when human beings first domesticated plants and animals and no longer relied entirely on hunting and gathering.
The deliberate effort to modify a portion of the Earth's surface through the cultivation of crops and the raising of livestock for sustenence or economic gain.
Concentration of trace substances such as carbon monoxide, sulfur oxide, hydrocarbons, and solid particulates, at a greater level than occurs in average air.
Power supplied by people or animals.
Belief that objects, such as plants and stones, or natural events, such as thunderstorms and earthquakes, have discrete spirit and concious life.
Legally adding land area to a city in the United States
Laws (no longer in effect) in South Africa that physicall separated different races into different geographic areas.
The total number of people divided by the total land area.
A religion that does not have a central authority but shares ideas and cooperates informally.
Balance of Power
Condition of roughly equal strength between opposing countries or alliances of countries.
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