Lake Huron’s Thunder Bay National Marine Sanctuary is home to at least 10 underwater sinkholes.
Formed as groundwater eroded the limestone below, these pockets create conditions where cyanobacteria, which first oxygenated the planet, thrive.
Find this story, and more, on the Great Lakes Now Youtube channel.
#GreatLakes #LakeHuron #Science #ThunderBay #Geology #Environment
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