Wetland pollution research. Agricultural engineer (left) collecting water samples as an ecologist uses a multimeter to record water quality at a constructed wetland, in order to determine how well the wetland filters pollutants. Photographed at Beasley Lake, Wisconsin, USA. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Ausmus, Stephen / US Department of Agriculture |
Bildgröße: | 3751 px × 2500 px |
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