Underwater volcanoes and lots of salt: A deep dive into the ocean
Brains On! Science podcast for kids
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Why Are Lakes and Rivers So Salty?
All the saltiness in the ocean got there from rivers. Many of these small chunks of rock and soil break apart and make salt. Lakes are different than the ocean in an important way. Even if you can't see a big river or a stream coming off a lake, there are still outlets. And these outlets eventually lead to rivers, and these rivers lead to the ocean.
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