Curious Kids Every Day: A Daily Educational Podcast
Sep 17, 2026 · 12 min · 8 segments
Ocean water contains dissolved salts that come mainly from minerals in rocks carried to the sea by rivers. This episode explains how those minerals reach the ocean, what evaporation does to them, and…
Josh TaylorHost
Okay, so where is all that salt in the ocean coming from? Well, a lot of it starts on the land with rocks.
[rocks clinking] See, rocks contain different minerals, and when rain falls onto the ground and hits the rocks, some of those minerals in the rocks get slowly dissolved into the water, and the amount is... it's very tiny.
Like, if you scooped some river water into a glass cup, you wouldn't see little pieces of salt floating around in there.
Now, the thing about water is that it's always moving downhill, and rainwater is the same way.
Once it comes down from the sky and hits the ground, it runs downhill into little streams.
Streams flow into rivers, and where do a lot of rivers eventually end up? Yep, the ocean.
[waves crashing] So rivers are constantly carrying small amounts of dissolved minerals from rocks on land into the ocean.
Shouldn't rivers taste salty, too? Well, rivers usually have a much, much smaller amount of salt in them.
They're also constantly moving, so fresh rainwater goes in, and the river water just keeps flowing somewhere else.
The ocean is where an enormous amount of that water eventually collects and gets concentrated, and then something else happens.
Have you ever left a wet towel outside on a hot day? What happened to the towel? Yeah, it doesn't take too long before that towel is mostly dry.
But when ocean water evaporates, guess what doesn't go up in the air with it? Yep, that dissolved salt.
So rivers carry tiny amounts of dissolved minerals into the ocean, then some of the water leaves through evaporation, while the dissolved minerals stay behind in the ocean.
Okay, so where is all that salt in the ocean coming from? Well, a lot of it starts on the land with rocks.
[rocks clinking] See, rocks contain different minerals, and when rain falls onto the ground and hits the rocks, some of those minerals in the rocks get slowly dissolved into the water, and the amount is... it's very tiny.
Like, if you scooped some river water into a glass cup, you wouldn't see little pieces of salt floating around in there.
Now, the thing about water is that it's always moving downhill, and rainwater is the same way.
Once it comes down from the sky and hits the ground, it runs downhill into little streams.
Streams flow into rivers, and where do a lot of rivers eventually end up? Yep, the ocean.
[waves crashing] So rivers are constantly carrying small amounts of dissolved minerals from rocks on land into the ocean.
Shouldn't rivers taste salty, too? Well, rivers usually have a much, much smaller amount of salt in them.
They're also constantly moving, so fresh rainwater goes in, and the river water just keeps flowing somewhere else.
The ocean is where an enormous amount of that water eventually collects and gets concentrated, and then something else happens.
Have you ever left a wet towel outside on a hot day? What happened to the towel? Yeah, it doesn't take too long before that towel is mostly dry.
But when ocean water evaporates, guess what doesn't go up in the air with it? Yep, that dissolved salt.
So rivers carry tiny amounts of dissolved minerals into the ocean, then some of the water leaves through evaporation, while the dissolved minerals stay behind in the ocean.
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