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Blue-green algae
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Morning Glory Pool hot spring in Yellowstone National Park, showing vivid rings of yellow, green, and blue created by cyanobacteria and algae thriving in the water.
Bright green algae blooms distort the surface of water.
blue-green algae cyanobacteria
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Blue-green algae: Media

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Videos

What Causes Algae Blooms?
Algae blooms can make lakes and oceans look like abstract paintings.
Video: Encyclopædia Britannica, Inc.

Images

Blue-green algae
The Morning Glory Pool at Yellowstone National Park in Wyoming is a brilliant display...
© Yoyo_slc/Shutterstock.com
blue-green algae
A bloom of blue-green algae sitting atop the water in a freshwater pond.
Christian Fischer
cyanobacteria
Cyanobacteria in a hot spring at Yellowstone National Park, Wyoming.
© Brad Pict/stock.adobe.com
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