When it blew on May 18, 1980, Mount St. Helens became the most explosive volcanic eruption in U.S. history. And no, it’s not done.
How On Earth
How do rainbows form? It’s all about light waves, water, and angles—and that includes the angle from which you see one.
The biggest tsunami ever recorded reached 1720 feet high—which is taller than the Willis Tower in Chicago.
If you want to behold some of the world's most majestic glaciers on six continents, you better act fast.
Volcanoes do more than just spew lava. They can usher in revolutions, inspire great works of literature, or even convince people they're seeing ghosts.