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Saline water is water that contains a high concentration of dissolved salts, mainly sodium chloride. Learn about the salinity levels, phase diagram, density, electrolysis and applications of saline water, such as desalination and hydrogen production.
Why is the ocean salty? Rivers discharge mineral-rich water to the oceans. 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 rivers, which drain the landscape, thus causing the oceans to be salty. Credit: NASA
Learn what saline water is, why the ocean is salty, and how saline water affects the environment and human uses. Explore the sources, properties, and challenges of saline water with examples and photos.
Seawater is water from a sea or ocean with about 3.5% salinity and various dissolved ions. Learn about its density, pH, chemical composition, sources and uses, and how it differs from freshwater and pure water.
Salt in the ocean comes from two sources: runoff from the land and openings in the seafloor. Rocks on land are the major source of salts dissolved in seawater. Rainwater that falls on land is slightly acidic, so it erodes rocks. This releases ions that are carried away to streams and rivers that eventually feed into the ocean. Many of the dissolved ions are used by organisms in the ocean and ...
Learn how salts enter and leave the ocean, and why some lakes are salty. Find out if the ocean is getting saltier due to climate change.
The average salt content of ocean water is 35 parts per thousand, which—while it may not sound like much—works out to 120 million tons of salt per cubic mile of seawater. And there are about 332,519,000 cubic miles (1,386,000,000 cubic km) of water in the ocean. Where did all that salt come from? It comes from the land, mostly.
Salinity is the saltiness or amount of salt dissolved in a body of water, usually measured in g/L or g/kg. Learn about different methods and scales of salinity measurement, and the major ions and minor ions that contribute to the salinity of natural waters.
If swimming in it isn't enough, you're reminded how salty the ocean is when you accidentally swallow some. Here's where that salt water comes from.
The ocean is salty because freshwater rivers and streams carry salts and minerals from land, and because hot water dissolves more salts from seafloor vents. Learn how salinity varies across the oceans and affects buoyancy, life, and water cycle.