Massive mystery holes appear in Siberian tundra — and could be

The dramatic 30-meter (100-feet) deep hole in Western Siberia is the latest of several to have formed in the region since 2014. Scientists think the craters are formed by an explosive buildup of methane gas but there is still a lot they don’t know.

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No, CNN, Craters in Siberia Aren't Caused by 'Climate Change

Massive mystery holes appear in Siberian tundra — and could be

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Mysterious Siberian hole likely due to methane buildup and release

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No, CNN, Craters in Siberia Aren't Caused by 'Climate Change