What is the Mariana Trench?

Have you ever swallowed a mouthful of seawater at the beach? Blegh! It is super salty! But why don't rivers taste like salt? In this mind-blowing episode of Science is Not Boring, Mira and Finn dive deep to uncover the ocean's biggest mysteries! You won't believe it, but if you magically took all the salt out of the ocean and spread it over the land, it would form a towering white wall 500 feet thick! That is as tall as a 40-story skyscraper! Join us as we learn how slightly acidic rain breaks down rocks to make this giant bowl of salty rock soup. Then, strap in as we plunge into the terrifying, pitch-black depths of the sea! We'll travel back to 1934 to ride in a tiny metal ball called the Bathysphere, and then drop all the way down to the Challenger Deep. Discover what it feels like to have the crushing weight of 50 jumbo jets pressing on you, and meet the weirdest, squishiest creature on Earth—the gooey deep-sea snailfish! Get ready to explore the freezing dark where no sunlight ever reaches!