Rocks in the Earth's crust often have long and complex geological ... A currently unexplained phenomenon is the loss of the unreactive gas xenon from our atmosphere more than 2.5 billion years ...

These anomalies are surprisingly similar to sunken chunks of Earth's crust but appear in seemingly impossible places. Potential patches of Earth's ancient crust, sometimes called "sunken worlds ...

Stable parts of the Earth's crust may not be as immovable as previously thought. While much of the crust is affected by plate tectonic activity, certain more stable portions have remained ...