Nobody knew what they are, and whether they are only a temporary phenomenon, or if they have been sitting there for millions ...

at the very center of the planet is the inner core, a solid ball of iron and nickel as hot as the surface of the sun. By watching how the earthquake waves behave inside the Earth's mantle ...

Then, enclosed within the mantle is the innermost metallic core of our planet. The mantle is Earth's largest layer of rocks. However, because it is covered by at least six kilometers of crust ...

scientists believe this liquid core has allowed the more solid inner core to spin separately from the Earth’s mantle. Now, though, that spin appears to have changed. To fully understand the ...

Continent-size islands deep inside Earth's mantle could be more than a billion years old, a new study finds.

The two giant blobs — one beneath the Pacific Ocean and one beneath Africa — lie at the boundary between Earth's mantle and its outer core, some 1,900 miles (3,000 kilometers) beneath the surface.