But fortunately, this idea is not true, because it may not be a good thing for human beings at all except to ease everyone's wallet a little.
Let's take a look at the sudden ice age, with more fresh water.
According to the research of geographers, there is evidence that such a geological accident happened 6 million years ago, which is called "Messina Salinity Crisis" by the scientific community.
The movement of continental plates blocked the Strait of Gibraltar, which led to the decrease of water entering the Mediterranean Sea, and the Mediterranean Sea almost dried up under the condition of continuous evaporation. The evaporated water vapor falls in other sea areas in the form of light rain, which slightly reduces the salinity of those sea areas. Note that not all the seawater in the world has become fresh water, but the salinity of seawater has just been diluted to the extent that it can freeze a larger area.
As a result, the ice area expanded, more solar energy bounced out of the atmosphere, and the earth entered the ice age.
As for the ice age, what it means to the vast number of biological groups, students should be more clear.
The ocean is the real power source of the earth's surface activities. In fact, most meteorologists now think that the ocean and the atmosphere are a single system. As long as these systems change slightly, it may bring unbearable consequences to the biosphere.
Students should remember that water is very good at storing and transferring heat, which is much more than you think.
For a simple example, the daily heat sent to Europe by the Gulf Stream is equivalent to the world's coal production in 10.
Sea water is not a unified whole. There are differences in seawater temperature, salinity, depth and density in different places, which have a great influence on the heat transfer mode of seawater, and then affect the climate. The main carrier of thermal plate transfer on the earth is the so-called hot-salt convection. Usually, this process is very slow. It takes 65,438+0,500 years for seawater to flow from the North Atlantic to the central Pacific, but it is the heat it transports that shapes the overall climate of the earth.
If the ocean is full of fresh water, all these will disappear, the earth will have no seasons and everything will die.
The ocean is also the guarantee for the earth to maintain a comfortable temperature. For a long time, the ocean absorbed a lot of carbon and hid it in a safe place, ensuring the proper temperature of the earth.
The burning intensity of the sun is about 25% stronger than that at the beginning of the solar system, so the earth would have been much hotter than it is now. But the earth was not affected by this disastrous result, and we miraculously escaped such a disaster.
Scientists' research shows that when carbon in the form of carbon dioxide in the air falls with rain, there are countless trillions of small marine life, and many students can't even name them, such as foraminifera, spherulites, calcareous algae and so on. These small marine creatures catch them and use them (among other things) to make their own small shells. They shut Tan in their own shells, sank to the bottom of the sea after death and were compressed into limestone. Thereby preventing this dangerous greenhouse gas from returning to the atmosphere. Keep the earth's temperature stable.
If we lose the ocean, then all this will cease to exist. The earth will become very hot and most life will cease to exist.
Conclusion As for the early gestation of life, it was in the vast ocean. 3.8 billion years ago, the earth's ocean was almost as big as it is now.
Humans are part of the evolution of life on earth. They originated from the ocean. If there is only fresh water, there will be no human beings at all.
Therefore, although fresh water is good, it can't replace the ocean.
What would the world be like if all the water in the ocean on earth was fresh water? Let's first analyze the stealth meaning of this topic. If seawater is fresh water, it will mean that the earth is not a planet with silicate as the main component, because after all, the water cycle on the earth will dissolve minerals in the soil in different ways, and 80% of the more than 100 elements known in the world can be found in seawater. If seawater becomes fresh water, that is, there is no salt in seawater, a series of profound changes will take place in the world, including but not limited to the following categories.
First, the unfavorable factors:
1. We all know that salt is indispensable in people's daily life and production. For example, people can't live without salt for three meals a day. In industry, salt is one of the most basic chemical raw materials and is called "the mother of chemical industry". If seawater becomes fresh water, people will lose an important way to extract sea salt. It is difficult to meet the current supply and demand relationship only by inland well salt and mineral salt, and salt may be upgraded to one of the strategic reserve materials.
2. Life in the ocean will be destroyed. As we all know, seawater is salty, and there are huge biological groups living in the ocean. They evolved with the continuous development of the earth for hundreds of millions of years, and have been deeply accustomed to the marine environment. If seawater becomes fresh water, most of these biological groups will die and become extinct because of the change of marine environment. Only a small number of organisms in the shallow sea area of continental shelf with low salt content may adapt to the fresh water environment and survive. Seafood, the favorite food of human beings, will become a tight product, and the map in the eyes of foodies will be completely changed.
3. With the deepening of economic globalization, international trade is becoming more and more frequent, and maritime transportation is the most important international trade mode, accounting for more than 2/3 of the total international trade. Because the density of seawater depends on temperature, salinity and pressure, its average density is between 1.02 1.07, which is slightly higher than that of water. If the salinity in seawater becomes zero, it is based on the characteristics of seawater.
4. Because the density of seawater decreases, the specific gravity of seawater decreases. Because the gravity that causes the tide remains unchanged, the impact of the tide on the offshore may become greater, and some coastal areas with lower altitudes may be affected.
2. Favorable factors 1. The water resources that can be directly utilized by human beings will not be limited to rivers, lakes and groundwater. In contrast, water resources will no longer be scarce. The phenomenon that "water is more expensive than oil" will no longer appear in Arabian Peninsula countries with tropical desert climate, and seawater can be used directly without desalination.
2. The coastal beaches will no longer be "poor", but will become cultivated land full of aquatic plants, and human beings will not have to conduct sea rice experiments, and the total grain output of human beings will be improved.
What would the world be like if all the water in the ocean on earth was fresh water?
In order to answer this question accurately, I think we must understand the following questions.
1) How did the ocean water come from?
As we all know, the age of the earth has been more than 4.5 billion years now. When it was first formed, there was little or no water. After 4.5 billion years of accumulation, coupled with water-bearing meteorites falling on the earth, the water on the earth has been increasing. Water is a liquid substance, which turns into rain through clouds and falls to the ground, and then flows to the lowest place on the earth through geosynclines (commonly known as rivers and streams) to form oceans. Because the water flows over the ground and washes away, it brings a lot of minerals on the ground into the sea, forming the vast majority of minerals on the ground, which are all in the sea. Due to the evaporation of seawater for billions of years and the pollution of nature, the concentration of water is getting higher and higher, and now it has become salty seawater.
2) What is the structural composition of seawater?
Seawater contains a lot of salt and minerals such as sodium and magnesium, as well as uranium ore used for power generation. There is combustible ice on the seabed, which is formed by the pressure of seawater. Then a large number of animals and plants can adapt to the survival of seawater through hundreds of millions of years of biological evolution. They are a good food chain for human survival. Due to the industrial revolution in the past 200 years, many industrial raw materials, such as fuel, fertilizer, medicine, power generation energy, etc. , must be extracted from seawater. It can be said that the ocean (seawater) is a treasure house for human survival and life.
3) What are the advantages and disadvantages of seawater desalination for human beings?
Due to global warming, the proportion of fresh water on the earth's land is low (only 10% or more), and large areas in Africa, the Middle East and the northwest of China, due to lack of water, have caused large-scale desertification, which has had a very bad impact on human living space. If seawater becomes fresh water, it will undoubtedly bring great benefits. For example, the supply of drinking water for human beings, agricultural irrigation and elimination, marginal environment, industrial water and so on. However, if seawater is desalinated, almost all plants and animals that can adapt to seawater (salt water) will disappear, and the ocean will also disappear, which contains industrial raw materials (seabed ice) that can and cannot exist on land. On the other hand, it is worth studying whether salt water and fresh water have the same positive effect on absorbing the heat energy of the earth space. Generally speaking, I think that if seawater turns into fresh water, it will definitely do more harm than good to mankind.
4) Can seawater be turned into fresh water?
Because the area of the ocean is larger than that of the land, coupled with the warming of the earth's temperature, iceberg glaciers in countries such as the Arctic Ocean are accelerating to melt, and more and more water flows into the sea. If only humans are used to purify it, it is stupid and impossible to achieve. Nowadays, it is more expensive for human beings to purify seawater for drinking than oil in the Middle East. If you think that the natural ocean suddenly reverses and turns itself into fresh water according to the laws of nature, it is an idiotic dream, which is purely self-deception.
My friends, our country is struggling for the great cause of comprehensively rejuvenating China. I hope you will ask less or no questions that have nothing to do with national construction. It is a pseudoscientific proposition that salt water in the ocean becomes fresh water, isn't it? ! ! !
If there are any mistakes in the above discussion, please advise. Please forgive me if I have offended you.
What would the world be like if all the water on the earth was fresh water? This is a brain hole. If the earth is full of fresh water, it will be a great good thing for the earth creatures who depend on fresh water for survival.
We know that the land of the earth is very short of water (fresh water, of course). Although 7 1% of the earth's surface is covered with water, it seems that water resources are very rich, but this is only an illusion, because 97% of this huge amount of water is salty seawater, and fresh water accounts for less than 3% of the whole water resources. It is conceivable that the fresh water resources on the earth are so precious. Take a look at the vast desert, the desolate Gobi, and think about the dry and hot land where it hardly rains, and you will understand that water is sometimes as expensive as gold.
It would be great if all the sea water on the earth turned into fresh water. This will be a wonderful thing for human beings who urgently need fresh water. To this end, we humans can give full play to our intelligence, open rivers and build canals, extract huge amounts of seawater to transform the desert Gobi, turn yellow sand into green, and turn dry land into fertile fields. Think about it, wouldn't it be beautiful?
But don't be too happy. When some dreams come true, the results may not be satisfactory. If all the sea water on the earth becomes fresh water, one thing is certain, that is, the environment of the whole earth will be changed.
First of all, the whole marine ecosystem will be destroyed, the chain of marine life will be broken, and all marine life will be extinct. Of course, if faced with such a result, we don't want to have seafood to eat, and there is no sea salt to supply human beings. The salt reserves on the earth will be greatly reduced and life will become less delicious.
Secondly, seawater has bactericidal function. Seawater contains high salt, which can purify seawater and kill harmful microorganisms in decomposed water. Once seawater becomes fresh water, this function of seawater will be lost, and the ocean will grow a large number of algae and various aquatic plants like lakes. Over time, the blue ocean will become a green ocean, and all kinds of aquatic plants will fill the sea like lakes and swamps. Since then, the clear waters of Wei Lan have bid farewell to us forever.
Finally, over time, after several years, a large number of corrupt aquatic plants were deposited in the sea, and a large number of breeding bacteria flooded the sea. The interaction between spoilage bacteria and bacteria will make the sea stink, and the sea breeze that may be blown is stinky. It just stinks. The terrible thing is that a large number of corrupt substances will produce methane, and a large number of bacteria will accelerate the production of corrupt substances, resulting in a vicious circle, and methane will continue to be produced.
Like carbon dioxide, methane can cause the greenhouse effect. If the vast ocean is producing methane, the result will be disastrous. As the temperature rises, the global glaciers and icebergs melt, the sea level rises and the land shrinks. For terrestrial creatures, being small on land is tolerable, but a sharp rise in methane content in the air is a disaster. Because methane is absolutely toxic to life on earth, a large amount of methane not only warms the earth and destroys the whole earth ecosystem, but even more frightening is that it may destroy all life on earth, including us.
Therefore, it is best to keep the sea blue and rich in salt, because all life on earth, whether directly or indirectly, benefits from the sea. Sometimes a big brain hole is not necessarily a good thing. When the brain is wide open, blood will flow out.
If seawater becomes fresh water, there will be wars and disputes in the world, which are incompatible with each other. Fire and water are incompatible.
Two thirds of the earth's surface is ocean. After turning into fresh water, all kinds of fish became confused because of electrolyte disorder, and finally died of renal failure. Algae and plankton, creatures that rely on light and action, will soon wither, embrace each other and die. The bare coast, mangroves and salt-tolerant plants along the coast collectively "set themselves on fire" and disappeared at the end of the world. All living things on the continental shelf are destroyed and rotted after death, causing seawater deterioration and polluting the whole atmosphere, which may turn into a terrible plague. ...
We humans live on land and have mineral salt supply, which can avoid a disaster. Deserts may become treasures because they can extract refined salt. Countries rich in salt may become rich overnight, and salt will become the most expensive resource in the world. The value of Qaidam basin has been revalued and turned into a new cornucopia.
After the ocean becomes fresh water, it evaporates violently, the world climate changes, the precipitation on the southern slope of the Himalayas is crazy, and Bangladesh and India are submerged in the Indian Ocean. The Yangtze River and the Yellow River can accept more water vapor transport, which may lead to floods, glacier development in the Qinghai-Tibet Plateau, and the snow line moving down. Because there is enough steam power, the spring breeze can reach Yumenguan and the hinterland of Xinjiang. We don't have to argue about the Himalayas anymore, and we don't have to worry about the construction of the Hongqi River. The desert in Xinjiang has turned green and has really become a big garden behind our country.
The polar ice sheets have spread to Australia's doorstep, and the Arctic cyclone has become cold and stable, so it has never been frozen to death in the south. Many ports in Europe are frozen and the navigation channels are blocked. Qinhuangdao Port in China is frozen and cannot be navigable for nearly a month in winter. In winter, Bohai Sea will become the largest skating rink in China.
In the south of our hometown, salt-drying plants and alkali plants closed down, and all coastal chemical industries stopped production, thus the coastal aquaculture industry lost opportunities. ...
The development of freshwater organisms is advancing by leaps and bounds. Freshwater fish seize the opportunity to occupy the ocean, and the vast ocean is dominated by them. Willow trees along the river take this opportunity to move to the seaside, and land and marine life are unified.
From this point of view, seawater has become fresh water, which is a profound disaster for the earth. When a geographical thing changes, it will trigger a chain reaction of the whole earth environment. We should attach importance to it, protect the earth, protect our home, please cherish our earth more.
How much salt is there in the ocean? If laid flat on1490,000 square kilometers, it will be about 140 meters thick.
Anyway, if the ocean is full of fresh water, it will be a short-term disaster for marine ecology, but it will be infinitely beneficial to land creatures, especially human beings.
First of all, the number of livable coastal areas in the world has increased dramatically, and even inland areas hundreds of kilometers away from the ocean will be crowded with people. For example, 5,000 kilometers of the eastern coastline of China may produce a livable area of 6,543,800 square kilometers. Only in this area, unlimited fresh water and advanced agricultural technology will be more than enough to feed 654.38 billion people.
Where there is water, there is industry and agriculture, and where there is a city, there is civilization. The number of coastal cities will increase rapidly, and it is not a problem for cities with a population of 6.5438+million to grow to hundreds.
Freshwater organisms will gradually occupy the ocean, especially freshwater algae and Asian carp. Those who like seafood will be unlucky, while those who like freshwater fish will have unlimited fish and shrimp to eat.
As for some people's salt, most of the salt in life comes from inland salt lakes. Sea salt is of poor quality and contains many impurities, so it is not used for eating. How much salt is there inland? Qinghai alone has 1000 billion tons of reserves, enough for China people to eat 10000.
The water resources on the earth are very abundant and almost inexhaustible, but the fresh water resources needed by human beings only account for 2.7% of the total water resources, and most of them are frozen in glaciers. In fact, human beings can use very little fresh water resources.
In order to solve the problem of fresh water shortage, many coastal countries are vigorously developing seawater desalination technology, such as Singapore, Saudi Arabia, United Arab Emirates, Israel and other countries have achieved good results in this regard.
(Seawater Desalination Plant)
However, seawater desalination requires a lot of energy, and the desalted ultra-concentrated wastewater also has many adverse effects on the surrounding marine environment. These problems are the bottleneck restricting the development of seawater desalination.
People have a good wish that the sea can be turned into fresh water, and then the water resources problem that plagues human beings will cease to exist.
But if seawater really becomes fresh water, it is not a good thing for life on earth.
First of all, the freezing point of salt water is lower than that of fresh water, which means that fresh water is more likely to freeze. For example, the Yellow River is easy to freeze in cold winter, but Qingdao and Yantai at the same latitude will not freeze.
If all the sea water in the world turns into fresh water, the area of sea ice will be larger in winter, and sea ice will reflect more sunlight and heat, leading to the decrease of global low temperature and even the ice age, which is a real disaster for life on earth.
Once entering the ice age, most creatures will perish and human civilization will suffer heavy losses.
In addition to causing global cooling, if all the oceans become fresh water, the mobility of the oceans will be weakened and the oceans will become stagnant water.
Like rivers, oceans are constantly flowing, which is called ocean current, and the difference of seawater density is one of the reasons for ocean current.
In fact, the density of seawater is different in different parts of the earth. For example, the salinity of the Mediterranean Sea is higher than that of the Atlantic Ocean, so the density of the Mediterranean Sea is higher than that of the Atlantic Ocean.
Due to the different density of seawater, the density current is formed in the two sea areas. High-density seawater from the Mediterranean enters the Atlantic Ocean from the lower layer, and low-density seawater from the Atlantic Ocean enters the Mediterranean Sea from the upper layer. This exchange will promote the exchange of heat and nutrients, prosper the ocean and have a favorable impact on the land climate.
Imagine that if all of them turn into fresh water, the fluidity of seawater will become worse, and the land will become barren because the ocean can't deliver enough warmth and precipitation to the land.
(seawater temperature and density are the main driving forces of ocean currents)
Generally speaking, turning seawater into fresh water is very unfavorable to the earth's ecology, and even has disastrous consequences. If we want to solve the problem of insufficient fresh water, we should start with saving and protecting fresh water resources.
What would the world be like if all the water in the ocean on earth was fresh water? I think in that case, there will be no life on the earth. Why do you think so? Ask a question first! The sea water of the earth's oceans is salty. Why is sea water salty?
The sea is salty and bitter. For those who survived the shipwreck, they drifted at sea, but faced with a lot of seawater, they couldn't drink a bite. How desperate this is. Seawater is salty because it contains a lot of minerals, among which sodium chloride accounts for the most, accounting for about 90%, followed by magnesium chloride, magnesium sulfate, magnesium carbonate and other minerals. The average salinity of the ocean has reached 3.5‰. So the sea water is salty and bitter. Seawater contains almost all mineral elements on the earth.
Illustration: Ocean
If the earth's oceans dry up, the remaining salt will form a salt layer about 60 meters thick on the seabed. If all these salts are scattered on the land, the land height will increase by 153 meters. You can imagine how much salt the ocean contains.
Where do these mineral salts in the ocean come from? Scientists believe that the salt in the ocean mainly comes from three parts. The product of weathering of earth's rocks. Soluble substances ejected from submarine volcanoes dissolve in seawater. Rivers on land dissolve the salt on land and finally transport it to the ocean.
In short, a large number of mineral elements on the earth flow into the ocean, accumulating more and more, and the seawater eventually becomes salt water. I know why seawater is salty, and I also know where the salt in seawater comes from. We know what will happen to the world if all the oceans on the earth are fresh water. If all the water in the ocean is fresh water, there will be no life on the earth.
Illustration: Salt in the ocean.
Why is this? We know that life can be produced on the earth because it has the basic conditions for life. Water, the energy from the sun and the rich material elements that make up life. If the water in the earth's oceans is fresh water, it can only explain one problem. The earth is a planet that is very short of material elements. The ocean has been formed for billions of years without dissolving many minerals, and it is still fresh water, which shows how barren the earth is! Where does life come from? It is precisely because the early oceans of the earth dissolved a large number of mineral elements that life began to appear in the oceans of the earth. Nowadays, the rich mineral elements in the ocean have also bred rich and colorful marine life.
Illustration: Primitive Ocean
Therefore, I think if the sea water on the earth is fresh water, life will not appear, and there will be nothing for us human beings. Do you agree with me?
Before answering this question, say something else.
What's the difference between fresh water and salt water? On the earth, water resources are divided into salt water and fresh water according to the different salt content. The water in seawater and saltwater lakes is salt water. Saltwater lake refers to a lake with a salt content exceeding 1%. For example, Qinghai Lake in China is a famous saltwater lake.
The water in glaciers, precipitation, flowing lakes and rivers in nature is generally fresh water. In fact, fresh water on land also contains salt. Fresh water refers to water with a salt content below 0. 1%. If the lake is not replenished with a lot of fresh water, the salt content in the lake will gradually increase under the action of evaporation, and it will become a salty lake over time.
97% of the earth's water resources are salt water, while fresh water is only 3%.
How does the water in the ocean come from?
The age of the earth is about 4.5 billion years. At the beginning of the earth's birth, there was no ocean and it should contain a small amount of water. However, all this water exists in the form of gas, and it doesn't become liquid until the earth's surface cools gradually.
At present, the mainstream view is that the water in the ocean comes from comets. The early solar system was full of dangers. The newborn earth is often hit by various alien small bodies. It happens that this comet contains a lot of ice. When the comet hit the earth, it released a lot of water resources on the earth, forming an ocean, and the earth also had a suitable environment to keep the water liquid.
A lot of evidence shows that there were abundant water resources and rivers and lakes on Mars, but the gravity of Mars was too small. Hundreds of millions of years later, all the water evaporated and disappeared into space. Poor Mars has only a thin atmosphere.
Where does the salt in seawater come from? 70% of the earth's surface is covered by the ocean, and all the water in the ocean is salt water, with a salt content of about 3.5%, of which 90% is sodium chloride. The salt content in different parts of the ocean is also different.
It can be speculated that the ocean that just appeared on the earth should be fresh water, or the salt content of seawater is very low. The surface layer of the earth contains salt minerals, and the salt in seawater comes from the dissolution of salt minerals in water. There are also mineral salts on land, which are finally gathered in the ocean through rivers under the action of precipitation. After hundreds of millions of years, the salt in seawater has gradually increased.
Only there is life on the earth, and life plays an important role in the balance of salt content in seawater. Inorganic salts are also necessary for life. Without the biological fixation of these inorganic salts, the salt content in the ocean would be much higher.
Okay, let's get down to business.
What will happen to the world if all the seawater in the global ocean becomes fresh water? It has been said above how the salt in seawater comes from. If a large amount of salt in seawater disappears, it means that a large amount of salt will disappear on the earth's surface.
It will mainly have the following effects on the world:
1, the living things in the ocean have adapted to the high salinity environment. If the seawater suddenly turns into fresh water, there will be a mass extinction in the ocean, which will be the sixth mass extinction event in the history of the earth. As seafood is greatly reduced, it will be difficult for us to afford seafood.
2. With the decrease of salt on the earth, both industrial salt and edible salt will become tight commodities, and the price of salt will rise sharply. At present, salt, as a necessity of human life, is mainly extracted from seawater.
As seawater becomes fresh water, the average density of seawater will become lower, and the climate on the earth will also change. In particular, the decrease of seawater salinity will increase the freezing point of seawater, which may make the earth enter the ice age again.
Before that, the seawater density in different areas would be quite different because of the high salinity of seawater and the different temperatures of seawater at different latitudes. Generally speaking, the density of shallow sea water with high temperature and low salt is low. At present, the seawater density in each area is between 1.02 ~ 1.07.
It is also good to change seawater into fresh water. For example, coastal wetlands can grow food, and Yuan Longping no longer needs to engage in sea rice; Hundreds of millions of people on earth will no longer have to worry about fresh water, and there will be a lot of fresh water resources available for human use.
Conclusion To sum up, turning seawater into fresh water has both advantages and disadvantages. Generally speaking, the disadvantages outweigh the advantages. If seawater becomes fresh water, it will cause global climate and ecological disasters.
Although fresh water is good, don't drink too much! what do you think? Welcome to comment.