The most high-resolution map yet reveals something we previously never knew about: an ancient ocean floor that may wrap around the core. This thin but dense layer exists around 2,900 kilometers below the surface.
That brings the total to 43,454 undersea mountains, almost doubling the number we knew about.
Japan has recounted its islands -- and discovered it has 7,000 more than it previously thought.
There may have been as many as 100 sinkholes in and around the two communities. Some of the holes appeared in remote areas, while many others appeared within yards from people's homes or beneath homes.
A new study of ancient geological events suggests that our planet has a slow, steady 'heartbeat' of geological activity every 27 million years or so. But we dont' know what causes it.
