Why is seawater salty? Where does the salt in the sea come from?

Introduction: The water we drink in daily life is fresh water, and the salt content of fresh water is less. However, most of the water in the earth is seawater, and seawater is salty, and it takes a lot of steps to remove the salt from seawater, so it is more difficult.

So why is seawater salty? What exactly does the salt in the seawater come from?

In fact, the existence of seawater on the earth was much earlier than humans, even earlier than the dinosaurs. Because the previous ecosystem of the earth was very unsuitable for living organisms, the environment of the earth at that time was also relatively harsh. But there were already oceans at that time, and in the process of crustal movement and the dissolution of minerals, the water in the oceans would be the first to dissolve the sodium chloride in the minerals, which is the main substance of what people call salt.

In such a situation, the sea water has been salty for a long time. In addition, this salty sea water has also given birth to a variety of marine life, some of which will appear on land and become land creatures. Therefore, in such a situation, it will be found that in fact, most of the organisms are still in the marine environment, and can adapt to the salty environment of the seawater.

Therefore, the salt in the seawater comes from ancient times, and the saltiness of the seawater is mainly due to the dissolution of minerals.

In fact, the marine environment is not as good as people think, and it is not as beautiful as it is shown on TV. It is not uncommon for some conservationists to find a lot of plastic left in the bodies of marine animals when protecting marine animals, and some sea turtles will use the plastic as food, and as a result, the plastic will be stuffed into their nostrils, which looks very painful. Because plastic is very difficult to degrade, and every time a wave hits the beach, it leaves behind piles and piles of garbage.

This is a great harm to the marine environment, which in turn can also cause damage to human bodies. Therefore, we must protect the marine environment and avoid pollution.

Because of the presence of salt in the sea, the sea water is salty. This is because after the water cycle, the seawater evaporates and crystallizes to form salt.

Because the salt content and minerals in seawater are particularly high, the salt in seawater mainly comes from the differentiation of rocks and integration into seawater, and the overflow of seabed magma will also cause an increase in salt content.

Because seawater contains a lot of salt, it is salty. The salt in seawater is produced by the dissolution process of minerals.

The salt in seawater mainly comes from the following aspects:

1.Dissolution of the earth's crust: The rocks and soils on the earth contain a wide variety of minerals that can be released into water bodies through the process of weathering and erosion.

When precipitation and underground cave water come into contact with rocks, they dissolve the mineral residues in the rocks and carry them into rivers and lakes and eventually into the ocean.

2.Groundwater and subsurface veins: Groundwater and groundwater veins on Earth also contain dissolved minerals. When groundwater flows through formations containing soluble rocks and salt deposits, they dissolve the salts in them and transport them to the ocean.

3.Volcanic activity: Volcanic activity carries minerals and molten magma deep underground to the surface and flows into the ocean via rivers. These lava and minerals also contain large amounts of salts.

4.Submarine fountains: Submarine fountains are solutions of water and minerals spewed from hydrothermal vents in the earth's crust. These hydrothermal fluids, which are rich in metallic elements and salts, are released into the ocean through submarine fountains.

Over time, these ** flood into the ocean and accumulate, causing the salt concentration in the sea to gradually increase. It is worth noting that the salt in seawater is a complex mixture of various ions, mainly including chloride ions, sodium ions, magnesium ions, calcium ions, sulfate ions, etc.

1.Salt of **.

Secondly, the salinity of seawater also has an important impact on the global climate. Different concentrations of salt in the ocean affect the density and velocity of seawater, which in turn affects the global ocean cycle and climate change. For example, the salt content in Arctic water is relatively low and dense, which will flow southward with the warm current, which will affect the climate of the Northern Hemisphere.

The salinity in seawater mainly comes from two sources: first, the minerals contained in the rocks and soil on the earth's surface, which flow into the ocean through surface waters and rivers; The second is minerals released by submarine volcanic eruptions, which enter the ocean through hydrothermal vents on the seafloor.

The salt elements contained in these minerals mainly include chlorine, sodium, sulfate, carbonate, etc., which are dissolved in seawater to form various salt compounds. Among them, sodium chloride is the most important salt compound in seawater, accounting for about 85% of the total salt content of seawater.

In conclusion, the salinity of seawater is one of the important factors in the marine ecosystem and global climate change. Understanding the role of salts in seawater can help us better protect the marine ecological environment and maintain global climate stability. Brief Bureau.

2.The role of salt.

Categories: Science & Engineering.

Analysis: There are various salts dissolved in seawater; In addition to sodium chloride (the scientific name of salt), there are other chemical components such as magnesium chloride, magnesium carbonate, potassium, sodium, etc., nearly 100 kinds of major and trace element salts.

The main salt content of seawater is the weathering of crustal rocks and volcanic eruptions over billions of years. The surface rocks are washed and eroded by the current, and the salt in them is constantly dissolved in the water; These currents continue to merge into great rivers and rush into the sea.

Scientists have found that the world's rivers transport 5.5 billion hectares of dissolved salts to the ocean every year. As the water evaporates, the salt in the seawater gradually settles, and over time, the salt accumulates more and more, so that the seawater becomes salty. In addition, the eruption of an undersea volcano and the overflow of magma will also increase the salinity of the ocean.

The river can't have the above situation, so it doesn't take it.

When viewed from outer space, the Earth is like a blue planet, and because more than 70% of the total area here is covered by water, this also determines that life on Earth cannot be separated from water. However, not all of the earth's water will be able to be used by microorganisms, only the water can be drunk, and the sea water cannot be immediately drunk. Due to the excessive amount of salt in it, the seawater is very salty, and if you drink it immediately, it will dry up and even die.

Why is seawater salty?

Seawater is often very salty, because there is salt up and down in it, and the salt here is not only the salt sodium oxide, which is commonly said, but also a small amount of calcium bicarbonate, oxidase and other components. It also happens that the presence of this ingredient makes the sea water more and more bitter, and it is not suitable for drinking immediately.

So the ocean, which occupies such a large area of the earth, has no use value for people? Nature is not, and everyone's daily life on the earth is inseparable from the provision of the earth's environment. But with the increasing scarcity of freshwater resources at this stage, scientists have turned their expectations to the ocean, and decided that it is all water.

With that goal in mind, scientists have developed desalination technology to deal with the problem of freshwater pollution.

The decision to desalinate seawater is a time-consuming and laborious project, and when scientists overcome the corresponding technical difficulties, there is still a question: Is the salinity of seawater stable?

If the seawater is going to get thalitier and thinner, then it is important that today's desalination equipment fully consider this problem in order to solve the specific problem more effectively. Will the sea become saltier and salier? This concern of scientists is also entirely possible, and it is decided that the ocean of this size will immediately be exposed to the ground and receive the sun's rays.

Everyone understands that water is volatile, and it can accelerate the rate of volatilization at high temperatures. When the ocean is exposed to direct sunlight, a lot of water evaporates, leaving behind the salt that accumulates in the deep sea, and the sea water is likely to become saltier and thinner.

Scientists who apply the idea that seawater will become saltier and saltier believe that the salinity of seawater is an acquired occurrence, and this salinity may be caused by the erosion of the ground rock layer by flowing water, and then the salt in the rock layer is dissolved in the water. If this is the case, the end result is that the water is volatilized, the salt is retained, and the sea becomes saltier and thinner.

However, some biologists have raised objections, they feel that the salinity of seawater is not singular, there is salt in the mainland, and it is also the salt produced by the eruption of deep-sea volcanic rocks. Most experts and scholars prefer this kind of term, and emphasize that even if the salt in the ocean will increase, it will not necessarily become more salty, and these soluble salts may have chemical changes with some chemicals in the seawater and accumulate in the deep sea, where they will be digested and absorbed by the deep sea, thereby maintaining the salt balance in the ocean.

Mainly because there is a lot of salt in the seawater, the sea water is salty. The salinity of the sea is quite stable and generally does not change.

The seawater itself also carries some salt, and because of evaporation, it is particularly salty, there are a lot of minerals in it, and because some substances enter the sea, some iron ore and aluminum ore are formed, and finally the salt in the seawater is very stable.

Because there are so many microorganisms and salts in seawater, seawater is salty. The salinity of seawater is very stable.

There is a lot of salt in the seawater, which is a variety of salts, so the seawater will be salty, and the salt is also unstable, and there will be all kinds of salt.