Scientists have found that a region under Antarctica under Antarctica has the lowest gravity on Earth, caused by convection in the mantle. The 'gravity hole' formed at least 70 million years ago and is now becoming more frequent. Researchers used earthquake data to reconstruct a gravitational map of Earth as it was during the late Cretaceous. The map offers insights into how the gravity hole formed and evolved. The strength of gravity in East Antarctica depends on how much mass lies between Earth’s surface and the planet’ core, but the region’ bulk doesn’t necessarily yield higher levels of gravity. The researchers also found that mantle processes could trigger a shift in the formation of a gravity hole, which could also have an effect on sea levels.