Mother Ocean Day is Saturday, May 9, so here’s a few facts about our waters. About 71% of the Earth’s surface is water-covered, and the oceans hold about 96.5% of all Earth’s water. Water also exists ...

All of Earth's deepest ocean trenches are located in the Pacific Ocean, a result of intense tectonic plate subduction. These ...

I spent years preparing to dive into the deepest place on Earth. Only a handful of people have traveled into the depths of the Mariana Trench, nearly 7 miles below the ocean surface. As a geologist ...

But what about the deepest place on land? It's tempting to plump for the Yarlung Tsangpo Grand Canyon in Tibet, which scars ...