Why is the ocean salty?

Answer

As rain is formed in the atmosphere, it absorbs carbon dioxide, making it slightly acidic when it falls on the land. This rain physically and chemically erodes the rock and carries various minerals and salts as it runs off into the ocean.

As the water re-evaporates into the atmosphere, the salt is left behind in the ocean. Over a long time period, the salt accumulates and becomes more concentrated. According to the U.S.G.S., about 3.5 percent of the weight of seawater comes from the dissolved salts. In addition to surface runoff, hydrothermal vents on the ocean ridge also contribute a large amount of salt and minerals to the ocean, adding to the overall salinity.

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Q&A Related to "Why is the ocean salty?"
The ocean is salty due to the break down and erosion of rocks and minerals. Most rocks and minerals are composed of sodium and chloride which is the primary salt found in ocean water
http://www.ask.com/web-answers/Science/Nature/why_...
http://i143.photobucket.com/albums/r139/Z498n68107125_32522350_1486.jpg.
http://wiki.answers.com/Q/Why_are_oceans_and_seas_...
Oceans are salty because the water that fills them contains dissolved salt, just like the kind we use on our food. The amount of salt in ocean water varies from place to place-depending
http://www.answers.com/topic/why-are-the-oceans-sa...
Why Is the Ocean Salty? Whale Sperm! By. David Emery. Netlore Archive: According to this forwarded email, a typical blue whale produces over 400 gallons of sperm when it ejaculates.
http://urbanlegends.about.com/library/bl_blue_whal...
1 Additional Answer
Ask.com Answer for: why is the ocean salty
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.
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