The mystery of circular depressions off the coast of California has been partially solved
Circular depressions about 500 feet wide off the coast of Central California are quite old and owe their longevity to sediment flows, new research shows. However, the original 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 packed into … Read more