Siberian crater mystery may be solved
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2014/08/siberian_crater.jpg?fit=840%2C460&ssl=1)
This mysterious crater cropped up in far northern Siberia in mid-July. Scientists propose that the hole formed when methane gas from thawing permafrost erupted to the surface.
Courtesy of Marya Zulinova, Yamalo-Nenets Autonomous/The Siberian Times