![](http://www.alamy.com/thumbs/6/4B06879E-7FE9-414C-BB4C-25DB4AB6950B/ECH83R.jpg)
Surface bloom or scum beneath frozen ice in a pond like an oil slick but made from protozoan and cyanobacteria
Size: 6144px × 4088px
Photo credit: © Yon Marsh Natural History / Alamy / Afripics
License: Licensed
Model Released: No
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