Credit: KATERYNA KON/SCIENCE PHOTO LIBRARY via Getty Images Continent-size islands deep inside Earth's mantle could be more than a billion years old, a new study finds. Known as large low-seismic ...

Here’s how it works. Continent-size islands deep inside Earth's mantle could be more than a billion years old, a new study finds. Known as large low-seismic-velocity provinces (LLSVPs), these ...

Use this interactive map to view the two largest Los Angeles County fires in other areas of the country.