Domes of frozen methane may be warning signs for new blow-outs

Several methane domes, some 500m wide, have been mapped on the Arctic Ocean floor. They may be signs of soon-to-happen methane expulsions that have previously created massive craters in a near-by area.

from Oceanography News -- ScienceDaily http://ift.tt/2qTr6uT
via IFTTT