High school ecology education. Sixth grade high school students learning about water quality. Here,a teacher is displaying a meter they will use to test various characteristics of water from the Detroit River. Photographed at the Detroit River Water Festival,Michigan,USA | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / West, Jim |
Bildgröße: | 5197 px × 3465 px |
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