Normal Size Small Size show me how
|Sulfur oxides and nitrogen oxides, emitted by burning fossil fuels, enter the atmosphere-where they combine 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.
|Active solar energy systems
|Solar energy system that collects energy through the use of mechanical devices like photovoltaic cells or flat-plate collectors.
|Commercial agriculture characterized by integration of different steps in the food-processing industry, usually through 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 Earth's surface through the cultivation of crops and the raising of livestock for sustenance or economic gain.
|Concentration of trace substances, such as carbon monoxide, sulfur dioxide, nitrogen oxides, hydrocarbons, and solid particulates, at a greater level than occurs in average air.
|Power suplied by people or animals
|Belief that objects, such as plants and stones, or natural events, like thunderstorms and earthquakes, have a discrete spirit and conscious life.
|Legally adding land area to a city in the United States
|Laws (no longer in effect) in South Africa that physically separated different races into different geographic areas.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.
|Process by which a state breaks down through conflicts among its ethnicities.
|A small geographic area that could not successfully be organized into one or more stable states because it was inhabited by many ethnicities with complex, long-sanding antagonisms toward each other.
|An east-west line designated under the Land Ordinance of 1785 to facilitate the surveying and numbering of townships in the United States.
|Industries that sell their products or services primarily to consumers outside the settlement.
|Biochemical oxygen demand (BOD)
|Amount of oxygen required by aquatic bacteria to decompose a given load of organic waste: a measure of water pollution.
|The number of species within a specific habitat.
|Fuel that derives from plant material and animal waste.
|A process by which real estate agents convince white property owners to sell their houses at low prices because of fear that black families will soon move into the neighborhood.
|Invisible Line that marks the extent of a state's territory.
|Large-scale emigration by talented people.
|Branch (of a religion)
|A large and fundamental division within a religion.
|A location where tranfer is possible form one mode of transportation ot another.
|A nuclear power plant that creates its own fuel from plutonium.
|British Received Pronunciation (BRP)
|The dialect of English associated with upper-class Britons living in the lOndon area and now considered standard in the United Kingdom.
|An industry in which the final product weighs more or comprises a greater volume than the inputs.
|An industry in which the final product weighs less or comprises a lower volume than the inputs.
|Services that primarily meet the needs of other businesses.
|The science of making maps.
|The class or distinct hereditary order into which a Hindu is assigned according to religious law.
|An area delineated by the U.S Bureau of the Census for which statistics are published; in urbanized areas, census tracts correspond roughly to neighborhoods.
|A complete enumeration of a population.
|Central Business District (CBD)
|The area of the city where retail and office activities are clustered.
|Central place theory
|Larger settlements are fewer and farther apart than smaller settlements and provide services for a larger number of people who are wiling to travel farther.
|A market center for the exchange of services by people attracted from the surrounding area.
|An attitude that tends to unify people and enhance support for a state.
|A grass yielding grain for food.
|Husks of grain separated from the seed by threshing.
|Migration of people to a specific location because relatives or members of the nationality previously migrated there.
|A gas used as a solvent, a propellant in aerosols, a refrigerant, and in plastic foams and fire extinguishers.
|Short-term, repetitive, or cyclical movements that recur on a regular basis.
|A sovereign state comprising a city and it immediate hinterland.
|Clustered Rural Settlement
|A rural settlement in which the houses and farm buildings of each family are situated close to each other and fields surround the settlement.
|Attempt by one country to establish settlements and to impose its political, economic, and cultural principles in another territory.
|A territory that is legally tied to a sovereign state rather than completely independent.
|A machine that reaps, threshes, and cleans grain while moving over a field.
|Agriculture undertaken primarily to generate product for sale off the farm.
|A state in which the distance from the center to any boundary does not vary significantly.
|The spread of something over a given area.
|Concentric Zone Model
|A model of the internal structure of cities in which social groups are spatially arranged in a series of rings.
|Relationships among people and objects across the barrier of space.
|The sustainable use and management of a natural resource, through consuming at a less rapid rate than it can be replaced.
|Businesses that provide services primarily to individual consumers, including retail services and personal services.
|The rapid, widespread diffusion of a feature or trend throughout a population.
|A set of religious beliefs concerning the origin of the universe.