Earth from space: Ethereal algal vortex blooms at the heart of massive Baltic 'dead zone'
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Earth from space: Ethereal algal vortex blooms at the heart of massive Baltic 'dead zone'

In 2018, satellite images captured a stunning spiral of cyanobacteria blooming in the Baltic Sea. The swirling mass of microbes helped to create a massive "dead zone" the size of West Virginia that starved the surrounding water of oxygen.