Water is so ubiquitous that most people probably take it for granted, but have you ever wondered why the vast majority of it ...

Where did all that salt come from if freshwater rivers are always emptying into the oceans? Clean rainwater is slightly acidic, enough to dissolve some minerals from the rocks and soil it touches.

On a wave-battered rock in the northern Pacific Ocean, a fish called the sculpin grips the surface firmly to maintain ...