What are the circular objects visible on this satellite photo taken over Libya?

oil fields
rocket pads
agricultural fields
solar panel fields
This is an astronaut photo of the Al Khufrah Oasis in Libya. The circular shape of fields is characteristic of center pivot irrigation. These fields are approximately 0.6 mile (1 kilometer) in diameter. Lighter colors indicate fields that have been harvested recently or just planted.
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reach: rather globalAfricadesertsdeserts of Africadeserts of North Africafarminggeographygeography of Africageography of North AfricaLibyaNorth Africasatellite imagessatellite photographytechnology

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oil fields
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