Sea levels rising rapidly in southern US study finds
“It’s a window into the future”
An ancient ocean floor has landed next to the Earth’s core, says study
Seismic waves from around the globe were sampled by equipment in Antarctica
Startlingly round formation with steep, smooth sides found on seafloor off California
It rises about 3,300 feet, has “relatively steep, smooth sides” and is rounded, with a diameter of nearly 3,000 feet, officials say