mantle
Ultra-Rare Diamond Reveals Secrets of Oceans of Water Deep Inside the Earth, Scientists Say
More water than all of Earth's oceans is thought to reside deep inside the mantle, and a newly-discovered gem just shed more light on the mystery.
Ancient Gas From the Dawn of Time Is Leaking From Earth's Core
Helium-3 released at Earth’s surface contains tales from the deep planet and the deep past.
The Massive Remnants of an Alien World Are Hidden Near the Earth's Core, Study Proposes
A new study suggests that an alien world that smashed into infant Earth and created the Moon might have left vast remains inside our planet.
Scientists Found a Hidden 'Jurassic World' Buried Underneath Australia
The subterranean remains of 100 volcanoes formed some 180 million years ago were detected under a major petroleum hotspot.
Mountains Bigger Than Everest May Lie Deep Inside Earth
Scientists used the second largest earthquake on record to glimpse the terrain 410 miles under our planet's surface.
There May Be a Quadrillion Tons of Diamond Buried Deep Inside the Earth
A new study estimates that Earth’s interior contains 1000 times more diamond than we thought.
There Is Liquid Water Over 400 Miles Below Earth’s Surface
A new type of ice found in diamonds suggests pockets of liquid water exist deep in Earth’s mantle.