Water leaking into Earth's core may have birthed a mysterious layer that churns out crystals 

 A new series of experiments has shown that the mysterious "E-prime layer," which surrounds Earth's outer core, is created by water that leaks deep into our planet's interior. 

https://cdn.mos.cms.futurecdn.net/iXPs5RizRfCBYpv8RokwGG.jpg

https://www.space.com/water-in-earth-core-forms-crystal-layer