The two ions that are present most often in seawater are chloride and sodium. The concentration of salt in seawater its salinity is about 35 parts per thousand; in other words, about 3. In a cubic mile of seawater, the weight of the salt as sodium chloride would be about million tons. A cubic mile of seawater can also contain up to 25 pounds of gold and up to 45 pounds of silver!
But before you go out and try alchemy on seawater, just think about how big a cubic mile is: 1 cubic mile contains 1,,,, gallons of water! Saltwater intrusion threatens the water supplies of many coastal communities. Management of these water supplies requires well-designed and properly maintained and operated salinity monitoring networks. Long-standing deficiencies identified in a salinity monitoring network in southwest Florida during a study Prinos, help to illustrate All water, even rain water, contains dissolved chemicals which scientists call "salts.
Water is fresh or salty according to individual judgment, and in making this decision man is more convinced by his sense of taste than by a laboratory test. It is one's taste buds that accept one water and reject another. Scientists are using a cadre of new weapons in the battle against an old nemesis — saltwater intrusion.
This image shows blue spheres representing relative amounts of Earth's water in comparison to the size of the Earth. Are you surprised that these water spheres look so small? They are only small in relation to the size of the Earth. These images attempt to show three dimensions, so each sphere represents "volume. Salt is also used as feedstock for chlorine and caustic soda manufacture; these two inorganic chemicals are used to make many consumer-related end-use products, such as.
This photo shows a road salt storage stockpile that is awaiting use for pavement deicing, Port of Milwaukee, WI. The use of salt to deice pavement can be harmful to aquatic life in urban streams.
The USGS is involved in studies that focus on the influence of winter runoff on aquatic ecosystems. Why is the ocean salty? The Atlantic Ocean near the mouth of the Amazon River has relatively low salinity due to the mixing of fresh river water with salty ocean water. Follow Life's Little Mysteries on Twitter llmysteries. Live Science. But these differences in salinity might get bigger in the future, because of climate change. Warmer climates may lead to more rain and melting ice in the northern hemisphere, and more evaporation in the southern hemisphere, which could change the saltiness of our seas.
The saltier that water is, the more dense or heavier it becomes. Along with warmer temperatures, this could affect how water moves around in the oceans, which could affect all life on our planet — not just the creatures living in the sea. This article has been updated to reflect the fact that sodium and chloride ions separate out when dissolved in water. You can:. Here are some more Curious Kids articles, written by academic experts:. Why does the light turn on? Splendid course for me.
I thought the coverage was good, starting from the Ocean weather system for currents. Perhaps too much on Salt, but the trip through the contents of the seas, the discovery of the deep sea vents and the fountains of life therein, to the latest disaster with accumulated rubbish and plastic, and the depletion of speci Review of Oceans Course es. Very high quality education on a hugely underreported subject. The oceans are vital to our lives and we need to know more about them. This course helps set the scene.
Category: FutureLearn Local. Category: FutureLearn Local , Learning. We offer a diverse selection of courses from leading universities and cultural institutions from around the world. These are delivered one step at a time, and are accessible on mobile, tablet and desktop, so you can fit learning around your life. You can unlock new opportunities with unlimited access to hundreds of online short courses for a year by subscribing to our Unlimited package. Build your knowledge with top universities and organisations.
Learn more about how FutureLearn is transforming access to education. Learn more about this course. Where does the salt come from? Rivers and rain are major inputs to the oceans, but they are freshwater not salty. Dr Will Homoky explains where the ocean gets its salt from.
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