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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

Some areas of the ocean are saltier than others. This image shows methane mussels living at the edge of a underwater brine pool in a cavern at a depth of 650 ...

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 ...

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.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.

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

Why are some of Earth's waters salty and others not? There are two clues that give us the answer. First, “fresh” water is not entirely free of dissolved salt.