JIM WARK / AGSTOCKUSA / SCIENCE PHOTO LIBRARY JIM WARK / AGSTOCKUSA / SCIENCE PHOTO LIBRARY
Circular fields. Aerial view of agricultural fields that are circular because they use centre pivot irrigation. This is a method where each field has a metal beam attached at the centre. The beam, which has sprinklers along its length, rotates around its pivot to ensure even watering of the crops. Photographed near Greenley in Colorado, USA.
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