The Von Thunen model was first proposed by the geographer Johann von Thunen. It concerns how agricultural land usage varies in relation to the proximity of that land to urban centers. Specifically Von Thunen noted that crops that spoil easily or require expensive transportation were located close to urban centers, whereas crops that stayed fresh for a long time and required less expensive transportation were located further from urban centers.

“Subsistence-farming” is the name given to a specific type of agricultural production in which an individual farmer, or a family, produces enough food to support himself or herself. It is common in especially rural or poor areas throughout the world.

The growing of crops like grapes and olives is closely associated with Mediterranean agriculture. A form of agriculture that practices in countries like Italy, Greece, and Spain on the Mediterranean and in regions of other countries such as Chile, Australia, the United States, and Argentina.

America, like most developed states around the world, has a very small percentage of its population employed in agricultural work. In the United States between one and two-percent of the population is currently employed in agricultural work as their primary form of labor. This question was guessable even if you did not know the exact number, because you should have guessed the lowest percentage available given the general trend of agricultural labor in America.

“Capital-intensive agriculture” is primarily distinguishable from labor-intensive agriculture in that capital-intensive agriculture makes greater use of machinery and involved relatively little manual labor.

All of these are physical districts except for a dangerous neighborhood, which is an example of an “emotional district.” According to Kevin Lynch, an emotional district is an area of a city that an individual has emotional feelings about (i.e. “this is where wealthy people live” or “this is a dangerous neighborhood”).

California, with its temperate and reliable climate and its varied terrain, has a very similar style of agriculture as that practiced in the Mediterranean. This is why traditional Mediterranean crops like grapes and olives grow so well in regions of California.

A “milkshed” is the term applied to an agricultural region in which milk is produced in large numbers.

In the Von Thunen model crops that spoil easily, such as dairy products, are most likely to be located close to urban centers to decrease transit time.

Derwent Whittlesey identified five key agricultural practices - as well as regions in which they were commonly practiced - that he considered vital to maintaining the population of developing societies. These include plantations; pastoral nomadism; intensive subsistence, rice; intensive subsistence, not rice; and shifting cultivation.