<p>Ocean water is full of mineral salts which enter through the rivers, passing through rock and soil. <strong>Water has a property of evaporation whereas salt does not, so a lot of salt is left behind.</strong></p>
<p>Oceans are saline throughout the world, but the Mediterranean Sea is saltier. Many oceans are less salty due to the regular mixing of fresh river water.</p>

Saltwater: The Reason An Ocean Is Salty

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<p>By <span><a href="https://www.livescience.com/author/live-science-staff"><span>Live Science Staff </span> </a> </span><time>17 September 2012 </time> </p>

<p>Oceans make up about 70 percent of Earth’s surface. But why is the ocean salty? </p>

<p>Ocean water contains lots of different mineral salts: sodium, chloride, sulfate, magnesium, calcium, potassium, bicarbonate and bromide. These salts enter the ocean through rivers, which pass over rocks and soil, picking up salt along the way. </p>

<p>This salt builds up in the ocean because the only way water can leave the ocean is through evaporation. And when the water evaporates it doesn't take the <a href="https://www.livescience.com/20179-salt-leading-killer-worldwide.html">salt </a>with it. So you end up with less water, and the same amount of salt, resulting in a pretty salty sea. </p>

<p>The same thing can happen to a smaller, landlocked body of water, such as the Great Salt Lake in Utah, where water evaporates quickly in the desert climate — the lake has dropped 20 feet since 1849. A favorite pastime for visitors is to float on the lake like a cork, because the high salinity makes people more buoyant. </p>

<p>Ocean salinity levels can vary dramatically from place to place. For example, the Mediterranean Sea is more salty than oceans off the coast of continents that have large freshwater rivers, such as the Amazon. The Atlantic Ocean near the mouth of the Amazon River has relatively low salinity due to the mixing of fresh river water with salty ocean water. </p>

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Why Is the Ocean Salty? | Salt in the Ocean | Live Science

Saltwater: The Reason An Ocean Is Salty

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