A satellite-mounted instrument has in just one year produced higher-resolution imagery of the global seafloor than that from comparable systems over the past 30 years.
Despite appearances, that surface is not flat, Yu said. The gravitational pull of underwater structures like hills and volcanoes causes water to pile atop those structures in spread-out lumps. Changes ...
Twenty years after the deadliest wave in recorded history, most oceans have warning systems and communities have learned how best to escape the danger.