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Center Pivot Irrigation
In very dry lands, farmers use pivot irrigation. They drill a hole for water, then spin a dripping pipe around to give water to the crops. Hence the circular shape.
This site is near Tabuk, Saudi Arabia. The photo is more recent, and shows more crop circles.
Questions:
- How far down do these pipes go to get the water?
- Is there enough water underground to water the crops?
- What percentage of crops in the world use pivot irrigation?