In dry areas cultivated fields will be found stretched along rivers or irrigation ditches which have brought water to higher ground. Snake River, southern Idaho. Crops can be watered with sprinklers which draw water from wells. In northeast Colorado, crops are found near the river, and to the east where circular fields indicate radial sprinkler systems fed by wells. In tropical forests, crops are often grown on small fields cleared by 'slashing and burning', which temporarily enriches the soil with nutrients but can lead to deforestation.
Pastures are larger fenced areas which have been cleared of trees and planted with grass.
Dams Dams are placed on rivers to create artificial lakes or reservoirs. The water is used for irrigation, drinking water, and hydroelectric power. Dams are most often found near a city. Hoover Dam on Colorado River. I TMArchive are processed to enhance the colors of rocks and fields.