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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

Sea water has been defined as a weak solution of almost everything. Ocean water is a complex solution of mineral salts and of decayed biologic matter that ...

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 ... Satellite view of La Plata River discharge to the Atlantic Ocean. One way minerals and salts are deposited into the oceans is from outflow from ...

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 ...

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

Sep 17, 2012 ... Salts enter the ocean through rivers, which, before entering pass over rocks and soil, and pick up salt along the way.

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 ...

www.sciencedaily.com/releases/2007/10/071012104955.htm

Oct 14, 2007 ... Today's ocean salt has ancient origins. As the earth formed, gases spewing from its interior released salt ions that reached the ocean via ...

curious.astro.cornell.edu/about-us/43-our-solar-system/the-earth/geology/97-why-is-sea-water-salty-and-not-lake-water-beginner

Jun 27, 2015 ... Over time, the oceans, which act as the final sink for almost all rivers, become more salty. Rivers that don't make it to the ocean are trapped in ...