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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

Ocean water is a complex solution of mineral salts and of decayed biologic ... in the foreground is nearly four times as salty as seawater and is so dense that a ...

oceanservice.noaa.gov/facts/riversnotsalty.html

Rain replenishes freshwater in rivers and streams, so they don't taste salty. However, the water in the ocean collects all of the salt and minerals from all of the  ...

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 isn't fresh like the rivers and streams that empty into it. Further, what is the ...

water.usgs.gov/edu/whyoceansalty.html

Dec 2, 2016 ... One way minerals and salts are deposited into the oceans is from outflow from ... on and in the Earth is saline—there's a lot of salty water on our planet. ... And, just so you don't think seawater is worthless, a cubic mile of it also ...

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

Mar 20, 2017 ... In the Dutch West Indies, the water is so salty it crystallizes into salt. The ocean contains a lot of sodium and chloride, which make salt.

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

So a few lakes are salty because rivers carried salts to the lakes, the water in the ... Water evaporates from the oceans to fall again as rain and to feed the rivers, ...

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? ... why such a basic question remained a mystery for so long—and where his team finally found  ...

www.bbc.com/future/story/20140411-why-is-the-sea-so-salty

Apr 11, 2014 ... Most of our planet's surface is covered in water – salt water. The oceans that support so much of Earth's life are around 3.5% sodium chloride ...

.ask.com/youtube?q=Why+Is+the+Ocean+so+Salty%3F&v=L9dpXa_Iemo
May 25, 2015 ... The ocean is salty, but most lakes and rivers are not. ... on my channel, they asked the same thing about me, why is poverty gaming so salty?.