How Do Oysters Make Pearls?
It sometimes starts with a grain of sand—but not always.
It sometimes starts with a grain of sand—but not always.
Few volcanoes had had such a dramatic and devastating impact on the world as Indonesia's Mount Tambora.
June has arrived, which means that hurricane season is here (the season officially runs from June 1 through November 30). When it comes to these massive systems, there's more than meets the eye.
Mount Everest is the tallest and highest peak on Earth. Or is it? Here’s everything you need to know about the world’s most famous mountain.
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.
As the saying goes, you can’t have a rainbow without a little rain. But you can have parhelia and circumhorizontal arcs.
How much do you know about the blue marble we call home? From how our planet formed to just how many species there are, here are 100 things you need to know about Earth.
How do rainbows form? It’s all about light waves, water, and angles—and that includes the angle from which you see one.
If you want to behold some of the world's most majestic glaciers on six continents, you better act fast.
The next time somebody points out a UFO-shaped cloud, you can whip out the word ‘lenticular.’ They’ll love it.
Just a handful of people have ever been to the deepest part of the ocean, but what we've learned about life in the hadal zone is astonishing.
On October 8, 1871—the same day the Great Chicago Fire killed 300—a far deadlier wildfire swept across Wisconsin.