THE FULL COLLECTION
Earth
3 Things in Earth. Select a category or move through the pages.
National Park ServiceThe sailing stones
Rocks cross Death Valley’s Racetrack Playa and score long trails into its surface. Researchers finally watched them move when shallow water, thin ice, sunlight, and wind aligned.
Alaska Earthquake CenterThe Lituya Bay giant waveIn 1958, an earthquake sent rock into a narrow Alaskan inlet. The resulting wave stripped vegetation from a slope more than 500 metres above the water.
National Park ServiceThe singing sandsAt Great Sand Dunes in Colorado, an avalanche of dry sand can produce a sustained low hum or boom as countless grains move together down a steep slip face.