A streamlet in the Stillwater State Forest Natural Area in Pennsylvania's Pocono Mountains displays the distinctive yellow tea colour of tannic acid from the oak leaves and hemlock needles in the water | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Gadomski, Michael P. |
Bildgröße: | 5407 px × 3959 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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