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The oceans are salty because small amounts of salt from the land areas dissolve in the waters of streams and rivers, and are carried to the sea.
When water evaporates from the oceans into the atmosphere, the salt is left behind. The amount of salt dissolved in the oceans is, on average 3.5 % by weight.

oceanservice.noaa.gov/facts/whysalty.html

The pool of brine in the foreground is nearly four times as salty as seawater and is ... Together, they make up over 90 percent of all dissolved ions in the ocean.

oceanservice.noaa.gov/facts/riversnotsalty.html

The saltiness of the ocean is the result of several natural influences and processes; water from rivers entering the ocean is just one of these factors.

water.usgs.gov/edu/whyoceansalty.html

Dec 2, 2016 ... One way minerals and salts are deposited into the oceans is from outflow ... These two make up over 90% of all dissolved ions in seawater.

www.thoughtco.com/why-is-the-ocean-salty-609421

Mar 20, 2017 ... Have you ever wondered why the ocean is salty and why most lakes are not? Here's a look at what makes the sea salty and its chemical ...

ponce.sdsu.edu/usgs_why_is_the_ocean_salty/usgs_why_is_the_ocean_salty.html

What arouses the scientist's curiosity is not so much why the ocean is salty, but why it ... And how does one explain ocean water's remarkably uniform chemical ...

video.nationalgeographic.com/video/TIL/150605-sciex-til-ballard-salty

How is it that we didn't know why the ocean was salty until 1979? National Geographic Explorer-in-Residence Bob Ballard explains why such a basic question ...

.ask.com/youtube?q=What+Makes+the+Ocean+Salty%3F&v=L9dpXa_Iemo
May 25, 2015 ... The ocean is salty, but most lakes and rivers are not. Why is this? Get 15% off http ://www.domain.com's s domain names and web hosting when ...

www.utdallas.edu/~pujana/oceans/why.html

Everyone also knows that fresh water in rain, rivers, and even ice is not salty. ... The salt content of seawater does not change because new minerals are forming  ...

www.livescience.com/32139-why-are-oceans-salty.html

Sep 17, 2012 ... Oceans are salty due to deposits made by rivers. Credit: Beach image via ... Oceans make up about 70 percent of Earth's surface. But why is the ...