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| 24862594 | The raising of animals or the growing of crops on tended land to obtain food for primary consumption by a farmer's family or for sale off the farm. | agriculture | |
| 24862595 | A precise science that involves altering the genetic strands of agricultural products to increase productivity. It is developed mainly in science laboratories and is then tested on farm fields around the world, where it has been, for the most part, extremely successful. | Biotechnology | |
| 24862596 | Professor of geography at the University of California, Berkeley, who started the field of cultural ecology, and began the hearths of seed agriculture and vegetative planting. He was one of the most vehement critics of the philosophy of environmental determinism. Instead he believed that humans had power over their environments and weren't simply a product of them. | Carl Sauer | |
| 24862597 | The farming of products for sale off the farm; it is usually a big business in developed countries and requires the use of heavy machinery. | commercial farming | |
| 24862598 | Describes the fact that an area's proximity to a body of water affects its temperature (e.g. because oceans have a moderating influence on temperature, areas near oceans experience less extreme temperature variations). | continentality | |
| 24862599 | Removing what nature originally produced in a location to grow what is desired. | creative destruction | |
| 24862600 | The planting of different crops each year to replenish the soil's nutrients that were lost to the previous crops. | crop rotation | |
| 24862601 | The growing of two crops per year to double agricultural output. | double-cropping | |
| 24862602 | The introduction of man-made chemicals and practices that, at times, have drastic effects on native soil and vegetation. | environmental modification | |
| 24862603 | Occurs when farmers are too productive, causing a surplus of crops and, therefore, lowering prices and producing less revenue for the farmers. | farm crisis | |
| 24862604 | Farms that specialize in cattle or hogs and may have thousands of head livestock, feedlots can create large amounts of waste runoff, air pollution, and groundwater contamination. | feedlots | |
| 24862605 | The slow change from nonagriculturally-based societies to more agriculturally-based ones through the gradual understanding of seeds, watering, and plant care. | First Agricultural Revolution | |
| 24862606 | After harvesting, commercial grain is sent to the market area, usually in semitrailers, where it is sold to a manufacturer who makes a product with the grain, such as bread. The product is then sold to a wholesaler, who sells it to a grocery store, where individual customers can purchase it. | food chain | |
| 24862607 | The mass planting and harvesting of grain crops, such as wheat, barley, and millet. | grain farming | |
| 24862608 | The manual clearing of rows in the field through the use of hoes, rakes, and other manual equipment. | intertillage | |
| 24894755 | Developed an Agricultural Land Use Model that suggested that certain crops were grown in direct relation to their distance to market. | Johann Heinrich von Thunen | |
| 24894756 | A system of farming where lots up to a half mile or more extend back from a river, which farmers use as their primary means of hauling their agricultural products to the market. | long lots | |
| 24894757 | A type of farming where cows raised on a farm are fed with crops that are grown on the same farm. | mixed livestock with crop production | |
| 24894758 | A government controlled economy in which the government dictates the quantity and type of agricultural products that farmers can produce. | planned economy | |
| 24903133 | Often occurring in less developed countries, plantation agriculture involves the cultivation of one crop to be sold in more developed countries (e.g. coffee plantations in Costa Rica) | plantation agriculture | |
| 24903134 | Subsistence farming based on little mechanization. This is currently performed by aboriginal tribes in Australia. | primary economic activities | |
| 24903135 | Activities that produce nothing one can physically touch but are important in society (e.g. selling internet time or providing satellite technologies, such as cell phone usage). | quartiary economic industries | |
| 24903136 | Usually involving only about 10-15 percent of the workforce in an economy, these sectors employ the people who make decisions concerning the trade of commodities at the governmental and business executive levels. | quinary sectors | |
| 24903137 | Coinciding with the Industrial Revolution, the Second Agricultural Revolution used the increased technology from the Industrial Revolution as a means to increase farm productivity. This revolution started exponential population increase. | Second Agricultural Revolution | |
| 24903138 | Industrial activities in which factories take raw materials, such as natural resources, and produce some type of product for either trade or sale. Many people in the United States are still employed in secondary economic activities. | Secondary economic activities | |
| 24903139 | The taking of seeds from existing plants and planting them to produce new plants. | seed agriculture | |
| 24903140 | The moving of farm fields after several years in search of more productive soil after depleting the nutrients in the original field. | shifting cultivation | |
| 24903141 | The process of burning the physical landscape for both added space and additional nutrients put in the soil. | slash and burn agriculture | |
| 24903142 | Producing the food that their families need to survive, these farmers depend on the crops that they grow and the animal products they raise for their daily sustenance. | subsistence farmers | |
| 24903143 | These farms, where no one resides permanently and migrant workers provide the majority of manual labor cheaply, go against the grain of traditional farming in the United States. | suitcase farms | |
| 24903144 | Service activities in which an increasing number of people are involved in selling goods rather than producing them. | tertiary economic industries | |
| 24903145 | Also called the Green Revolution, this transformation began in the latter half of the 20th century and corresponded with exponential population growth around the world. | Third Agricultural Revolution |
