What's causing mysterious 'ice rings' to form in the world's deepest lake?

What’s causing mysterious ‘ice rings’ to form in the world’s deepest lake?

by Laura Geggel, LiveScience

The culprit was swirling beneath the ice.

The humongous, mysterious “ice rings” that pockmark the world’s deepest lake during Siberia’s winter and spring months may look like icy crop circles, but they’re not due to alien activity, atmospheric conditions or even, as previously thought, methane bubbles percolating from the lake’s bottom. 

Rather, it appears that warm, swirling eddies of water under Lake Baikal’s thick ice are responsible for these ice rings, some of which are up to 4 miles (7 kilometers) in diameter and can be seen from space, a new study finds.

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