seafloor

Sea Sponges Are Moving Around the Arctic Ocean Seafloor

The region under threat is built on the world’s largest river delta, and water is everywhere. Widespread poverty, soft sediments and rapidly multiplying infrastructure including bridges like this one near the southern city of Khulna make the region exquisitely vulnerable to earthquakes. Credit: Kevin Krajick/Lamont-Doherty Earth Observatory

A Giant Quake May Be Lurking Under Bangladesh and Beyond