The mystery of circular depressions on the coast of California has been partially solved
Circular depressions about 150 meters (500 feet) wide off the coast of central California are quite ancient and owe their longevity to sediment flows, new research reveals. However, their root cause has yet to be discovered. The Sur Pockmark field has puzzled oceanographers since its discovery in 1998. More than 5,000 shallow circular depressions are … Read more