Mon Prof Augmenté
Salt in the ocean
Age 16 · Geography
Rivers carry dissolved minerals from weathered rock into the sea, and the water that evaporates leaves those salts behind. Some of them later settle onto the seafloor, which keeps the ocean’s saltiness roughly steady over long periods.
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Age 16: open this week
Browse Age 16
In the picture
- Rain on bare rock: water loosening mineral grains from stone
- River mouth: dissolved minerals arriving in the sea
- Sea surface under the sun: water turning to vapour while salts stay behind
- Crystals on the seabed: salts settling out and leaving the water
Examples
- Salt left on a road after a puddle dries up
- A salt crust forming at the edge of a dried-out lake
Key takeaways
- The sea’s saltiness stays roughly steady because what enters and what is removed balance out.
- Most dissolved material reaches the ocean through rivers flowing from the land.
Quiz: Salt in the ocean (Age 16)
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Which process adds dissolved salts to the ocean?
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What happens to salts when seawater evaporates?
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How does salts settling on the seafloor affect ocean salinity?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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