Having fun with the program Google Earth decided to see what it looks like America from a height. Almost immediately stumbled upon an unusual to me, as fields of Nevada.
Looks like a cluster of unusual locator-type objects. At approach everything became clear. It turns out these are the fields for sowing crops.
The round shape of the fields is explained by the irrigation system. It's circular.
As you know the places here are arid and the provision of water fields should be constant. Local farmers have come up with such a solution. In the middle of the field, water is supplied, which is distributed in a circle with the help of a long rod. I certainly much accustomed to seeing the field a rectangular shape and such a round look extremely exotic, although and enough talk.