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39 Cards in this Set

  • Front
  • Back
Doubling Time
DT=70/ %growth rate
Population Change
Ecological Footprint
Total Land area needed to support one individual in a country
Breaking of rock by wind, water, and freezing
As water moves down soil, it carries nutrients and dissolves them away.
Chemical Weathering
When water dissolves some minerals found in rocks.
The study of population
Exponential Growth
Growth by a given rate %
Linear Growth
Growth by the same amount every year
Group of individuals of teh same species living in a certain area.
Crude Birth Rate
Number of births per 1000 individuals per year
All individuals that are capable of interbreeding
Crude Death rate
Number of deaths per 1000 individuals per year
GNP Per capita
Gross National Product, includes the value of all domestic and foreign output per person
Replacement-level fertility
The total fertility rate required for a population to remain constant
Total Fertility Rate
Avg number of children expected to be born to a woman during her lifetime
Life Expectancy
AVG number of years an individual can expect to live given his/her present age
Logistic Growth
When a Small Population Grows rapidly, but teh growth rate slows down. Teh population reaches a constant size eventually.
Green Revolution
Crops being modified genetically to produce higher yields, grow in poor conditions or fight pests off. Teh period is refered to as green revolution
Limiting Factor
Single Requirement for growth that is available in the least supply in comparison to teh need of the crop
Liebig's Law of teh minimum
The idea that some single factor determines teh growth and tehrefore teh presence of a species
Sustainable yield
The amount produced per unit area that can be continued indifinitely without decreasing the ability of that crop species to sustain that yield
Limits to food production
Global Warming
Population Growth
Development of higher producing crops
Primary and secondary effects of sgriculture
climate changes
Topsoil is in layer A which contains organic matter
Components of fertile soil
Wheathered rock
Organic Material
Living Organisms
Teh process of creating a desert where there was not one before
When the carrying capacity of land for herbivores is exceeded
Game Ranching
Mantaining wild herbivores in their native habitat to be harvested for meat and leather
Contour Plowing
Plowing land across topographic contours
Subsistence Crops
Crops used directly for food by a farmer or sold locally where teh food is used directly
Per capita food production
amount of food production per person
Per capita demand
Economic demand per person
planting of large areas with a single species or even a single stain .
production of food from marine habitats
Growing plants in a fertilized water solution in an artificial environment
Drip irrigation
irrigation by the application of water to teh soil from tubes that drip water slowly
Cash crop
Crops grown to be traded in a market
Production of food from aquatic habitat