Earlier studies have suggested the possibility that Earth was once covered with water. New evidence - focused on Earth's mantle - suggests our planet was a true water world, covered by a global ocean, billions of years ago.
A new animation illustrates how Antarctica was linked to its ancient neighbors – today’s Australia, India and South Africa – as part of the ancient Gondwana supercontinent.
Steamboat Geyser in Yellowstone National Park began a new period of heightened activity in March 2018. It's had more than 100 major eruptions since then. Scientists want to know why.
A billion years from now, as the sun heats up, the warmer atmosphere will break down carbon dioxide, killing off plant life, which in turn will shut off Earth's source of oxygen.
Three very strong earthquakes in the ocean near New Zealand took place in less than 8 hours on Friday, local time. Tsunami warnings went out across the Pacific, including Hawaii, but have now been lifted.