Why is the Ocean Salty? 7 Science-Backed Explanations

By Sheetal Kumari | January 16, 2025

Why is the Ocean Salty? 7 Science-Backed Explanations

Oceans cover about 70% of the Earth’s surface. But why are they salty? Discover the science behind the ocean’s saltiness!

Why is the Ocean Salty?

(Image:Canva)

Volcanic gases dissolve in water, forming acids. These acids dissolve minerals, which create ions, making seawater salty.

1. Volcanoes Contribution 

(Image:Canva)

Rivers carry eroded minerals into oceans. These minerals release ions like sodium and chloride, adding to ocean salinity.

2. Erosion from Rocks

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When ocean water evaporates, only water leaves. The salt is left behind, increasing the ocean’s salinity.

3. Evaporation 

(Image:Canva)

Salinity remains steady at about 35 parts per thousand. This balance is maintained through natural processes.

4. Why is the Ocean Salty?

(Image:World Ocean Atlas)

Marine organisms absorb ions from the water. This helps prevent the ocean from getting too salty over time.

Ocean Life Absorbs Ions

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Some ions in the ocean form minerals. These minerals help regulate the ocean’s salt levels.

Formation of New Minerals

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Lakes usually don’t taste salty because, they have fewer sodium and chloride ions. Water drains out, carrying minerals away.

Lakes vs. Oceans

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The ocean’s saltiness is a result of volcanic activity, erosion, evaporation, and more. Nature’s balance keeps the sea just the right amount of salty!

Nature’s balance

(Image:Canva)

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