Zealandia, which some researchers believe could be considered Earth's eighth continent, is older than previously thought.

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

“It could be either ancient ... enigmas deep blow the Earth’s surface. Darren lives in Portland, has a cat, and writes/edits about sci-fi and how our world works. You can find his previous ...

One of these methods is by setting up seismographic stations to measure seismic waves as they travel through the Earth—every moment ... “It could be either ancient, silica-rich material ...