"The large-scale flow reversal beneath the Pacific raises new questions about the behavior of Earth's deep interior," ...

Today, more than 70% of Earth is covered in liquid water. But long before the sea became a familiar feature of our planet’s surface, the water that now fills our oceans, lakes, and streams was ...

It isn’t easy to figure out how the Earth was built, because it happened 4½ billion years ago, and no one was there to watch. So scientists have had to look at what the Earth looks like now and at all ...