Here's why:
* Geological processes: The vast majority of salts in the ocean come from the weathering of rocks on land. Rainwater is slightly acidic, and as it flows over rocks, it breaks down minerals and carries them into rivers and eventually the ocean. This process has been ongoing for billions of years.
* Hydrothermal vents: Another significant source of salts is hydrothermal vents, which are hot springs on the ocean floor. These vents release minerals from the Earth's interior into the water.
* Human impact: While human activities do contribute to some pollution and changes in ocean salinity, the amount is minuscule compared to the natural sources.
It's important to remember that the ocean is a vast and ancient ecosystem. The processes that have shaped it over millions of years are far more powerful than any human impact.
