The Earth is akin to a rocky, molten-in-the-middle nesting doll – or perhaps a rotting, soft-centered onion, though the latter analogy affords our majestic planet much less dignity. Although only ...

Earth's inner core, composed primarily of iron with a small percentage of light elements, may enter a superionic state at extreme pressure and temperature, according to experimental results from ...

What the research is about Earth's inner core is thought to consist mainly of iron, yet many questions remain about its ...

While Earth's core consists mostly of iron, its density implies that lighter elements are also mixed in. Because hydrogen is abundant in the universe and can mix with iron under certain conditions, ...

Add Yahoo as a preferred source to see more of our stories on Google. (Rost-9D/iStock/Getty Images Plus) The Earth is akin to a rocky, molten-in-the-middle nesting doll – or perhaps a rotting, ...