Mysterious changes near Earth’s core

Material deep inside Earth — thousands of kilometres down, near the planet’s core — has undergone a mysterious shift. Scientists spotted signs of the change in measurements of the planet's gravity, recorded around 2007 by the US-German GRACE satellites. Researchers think that the movement could be linked to a type of mineral called a perovskite, in rocks near the bottom of Earth’s mantle, that changed its structural configuration in response to the crushing pressures deep inside the planet.