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An Oligotrophic Lake

An Oligotrophic Lake
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Description: Crater Lake in Oregon is a collapsed volcano that filled with snow melt. It began filling about 7,700 years ago. Thus, from a  geologic standpoint, it is a young lake.
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Height: 718 Width: 1500
Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47300
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