The country's fiery liquid landscape shifts, on a massive scale. By Michael Dumiak Kristín Jóhannsdóttir woke at two in the morning, looked from her window over fields to the east, and saw curtains of ...

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

Earth’s mantle behaves like a slow-moving fluid, but that hasn’t stopped two vast regions at its base from maintaining a separation from the rest. These continent-sized areas are hotter than the rest ...