High school ecology education. Sixth grade high school students learning about water quality. Here,they are throwing a container into the Detroit River to retrieve a sample of water for testing. Photographed at the Detroit River Water Festival,Michigan,USA | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / West, Jim |
Bildgröße: | 5197 px × 3425 px |
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