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 […]
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 […]