Ask Smithsonian: Why Are Lakes Freshwater and Oceans Saltwater?

Erosion, evaporation, and a leaky faucet, our host Eric Schulze breaks it all down (1:15)

Ask Smithsonian is a weekly video series that unravels some of science's most surprising mysteries. The series is made possible through the support of GEICO. Smithsonian members could save even MORE with a special GEICO #MemberDiscount on auto insurance.

Have a question in mind? It's your turn to Ask Smithsonian.

Latest Videos

Preview thumbnail for video'Why Polar Bears Like to Wrestle in the Winter
Why Polar Bears Like to Wrestle in the Winter (1:37)
Preview thumbnail for video'Why Tomato Juice Tastes Better at 37,000 Feet
Why Tomato Juice Tastes Better at 37,000 Feet (3:07)
Preview thumbnail for video'Ask Smithsonian: Can Elephants Jump?
Ask Smithsonian: Can Elephants Jump? (0:49)
Preview thumbnail for video'Would You Get This Close to a Goliah Tigerfish?
Would You Get This Close to a Goliah Tigerfish? (4:01)
Preview thumbnail for video'Ask Smithsonian: What Is Wind?
Ask Smithsonian: What Is Wind? (1:09)
Preview thumbnail for video'Unbelievable Footage of Exploding Plants
Unbelievable Footage of Exploding Plants (1:53)
Preview thumbnail for video'A Mongoose and Black Mamba Fight to Death
A Mongoose and Black Mamba Fight to Death (2:33)
Preview thumbnail for video'Ask Smithsonian: How Do Colors Affect Our Moods?
Ask Smithsonian: How Do Colors Affect Our Moods? (1:11)
Preview thumbnail for video'Ask Smithsonian: Why Do We Sneeze?
Ask Smithsonian: Why Do We Sneeze? (1:21)