High school ecology education. Sixth grade high school students learning about water quality. Here,they are being shown how vegetation can filter rain water,leading to cleaner lakes and rivers. Photographed at the Detroit River Water Festival,Michigan,USA | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / West, Jim |
Bildgröße: | 5197 px × 3673 px |
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