South of Sri Lanka, the Indian Ocean’s surface dips in a broad, subtle depression that has puzzled geophysicists for decades. The sea level there sits more than 100 meters below the theoretical shape ...

The ground may feel steady underfoot, but the planet is always in motion. While satellites and sensors have mapped the surface in fine detail, what lies beneath remains largely unknown. The crust, a ...

Add Yahoo as a preferred source to see more of our stories on Google. The Indian Ocean Geoid Low spans 1.2 million square miles where a deep gravity anomaly causes the sea surface to sink by as much ...