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What causes some lakes to turn green?

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DNR QUESTION OF THE WEEK

Editor's note: The following is the Minnesota Department of Natural Resource's "Question of the Week."

Question: What causes many lakes, rivers and ponds to turn green by mid-summer? Some even have an odor.

Answer: By mid-summer many waterbodies turn green due to the growth of small microscopic plants in the water called algae. Algae grow in all bodies of water when light and nutrients levels are sufficient.

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