Few people think about the difference between the sea and the ocean, except for size. Many of the reservoirs are located on the same square kilometers. In addition, these terms are often used incorrectly. And this is a common mistake. It is necessary to know the main signs of the ocean and the sea. There are certain subtleties that allow you to determine the type of reservoir.
What is the sea?
To understand how the sea differs from the ocean, you should understand what each of the reservoirs is. There are several main differences. So, the sea is a certain part of the oceans. As a rule, the boundaries of this reservoir are separated by land. It could be underwater. An example is the Sargasso Sea. It can also be separated by a series of islands or archipelagos. In this case, Baffin or the South China Sea can be cited as an example. Often this type of reservoir is separated by the outlines of the continents or peninsulas. An example would be the Mediterranean or the Arabian Sea. But this is not the main feature.
So what is the difference between seas and oceans? There is a broken bond between them. Therefore, the sea has several features of the hydrological regime. Here, indicators of transparency, salinity and water temperature are often measured. In addition, the sea has its own system of currents, as well as fauna and flora, which differs from the oceanic. 
Main groups
What is the difference between the sea and the ocean? You can visually tell the difference. After all, the ocean is ten times larger. At the moment, there are 63 seas on the surface of the Earth. Conventionally, they are divided into several groups and classified according to the degree of isolation from the parent ocean. There are marginal and inland seas. The latter are cut deep into the continents. An example is the Baltic, Black, Marble and Mediterranean. They are connected to the ocean only by a system of straits. In addition, these reservoirs have a clear difference. They have their own indicator of water salinity and the endemicity of living organisms that inhabit them.
As for the marginal seas, they are located along the coast of the mainland. These reservoirs are less isolated from the ocean. At the same time, their waters are regularly and actively mixed. Examples include the Tasman, East China and Norwegian Seas.
An exception
Of course, any rule can have an exception. What is the difference between the sea and the ocean if it has no shores? This should include Sargasso. It has no shores. This sea is located in the middle of the Atlantic Ocean. And to be more precise, in tropical latitudes.
There are also bodies of water that are only called seas. Take at least Dead and Caspian. In fact, they are not seas. According to some indicators, they fit into the category of "lakes".
In addition, there are historical names. This should include the Tyrrhenian or Ligurian Sea, which are one of the parts of the Mediterranean Sea. 
What is an ocean?
Of course, not everyone understands how the seas differ from the oceans and how to determine whether a reservoir belongs to a certain category. So what's the difference? What is an ocean? This is also part of the oceans. At the moment, four such reservoirs have been identified: the Arctic, Indian, Atlantic and the largest - Pacific. In some foreign schools, there is also a fifth ocean - the South. It surrounds the coast of Antarctica. Its second boundary is the course of the Western winds. In some countries, the Arctic Ocean is not considered an ocean at all. It is called the giant sea. Here the Arctic Ocean is one of the parts of the Atlantic Ocean.
With this classification, it is very difficult to understand how the sea differs from the ocean. Each of the reservoirs has its own bottom topography, salinity index, temperature regime and current system. However, an active exchange of water masses was noted. If you wish, you can get from one point to another without stepping on land.
The boundaries of the oceans are the slopes of the continents, individual islands, as well as meridians passing through points from Australia, Africa and South America to Antarctica. They are united by a system of straits: Magellan, Drake or Bering.
It is worth noting that all the oceans occupy up to 71% of the planet's surface. That is why scientists believe that the Earth has the wrong name. It was more logical to call her Aqua or Ocean. 
How is the sea different from the ocean?
At the moment, the following differences can be distinguished:
- The sea is a unit of a particular ocean. The ocean is an essential part of the World Ocean, which occupies 2/3 of the planet.
- Sizes of reservoirs.
- There are 4 oceans and 63 seas on Earth.
- flow system. The ocean has surface cold and warm water masses. The sea has only one current. It can be a surface warm or cold current.
- The bottom of the ocean is the earth's oceanic crust, and near the sea is the continental plume. The exceptions are the Sargasso and the Philippine Seas.
Comparing marine and freshwater aquariums, we will identify some of the most significant differences. First of all, this concerns the cost of maintenance, as well as the peculiarities of caring for both the aquarium itself and its inhabitants.
This article is intended specifically for those who are at a crossroads: what to choose? So, let's begin.
Types of aquariums
Speaking of freshwater aquariums, we often hear: aquariums for African and American cichlids, pseudo-marine aquariums, planted, for show fish and many, many others. Naturally, marine aquariums have their own varieties. They are, however, not so numerous. There are three main types of marine aquariums: fish only, fish and live rock, and reef aquariums. Naturally, the cost of their purchase and maintenance is also different. Fish-only tanks are the cheapest, followed by fish and live rock tanks, and finally the champions, reef tanks, which are expensive to maintain. It should be noted that today an increasing number of people are inclined to use sumps for marine aquariums, since they have a number of undeniable advantages.
aquarium installation cost
Let's start with the prices for the purchase of an aquarium and the necessary equipment. To keep things simple, we'll look at fish-only tanks and reef tanks filled with corals and invertebrates. Before you is a list of equipment necessary for the functioning of a freshwater aquarium. Please note that the prices are approximate, and we used a furnished aquarium with a volume of 300 liters. European brands were taken as a basis: Eheim, Deltec, Aqua Medic, Tunze, etc.
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Freshwater aquarium for keeping African cichlids |
Marine aquarium with live rocks |
reef aquarium |
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Aquarium |
Aquarium with overflow shaft and comb |
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coral sand |
coral sand |
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SJO Canister (external) filter, thermostat, compressor |
lifting pump |
lifting pump |
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Lighting T8 2pcs |
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Test set |
Auto-topping system including: storage tank and pump |
Auto-topping system including: osmosis, storage tank and pump |
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Inventory |
Inventory |
Inventory |
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Volumetric background |
Pump currents2pcs |
Controlled flow pumps including controller |
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Approximate cost |
Lighting T5 4pcs |
Metallic lamp T5 including T5 2pcs and "moon" |
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SAMP + pvc fittings |
SAMP + pvc fittings |
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Living stones 40kg |
Living stones 70kg |
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Approximate cost |
BP source |
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Relay programmable |
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Approximate cost |
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As you can see, saltwater aquariums require additional aquarium tests and some equipment not needed for a freshwater aquarium. You will need to purchase a good skimmer and good quality live rock. Living stones are a kind of biological filter, and buying them will save you from having to get an additional filter. The skimmer, in turn, will help dissolve the waste. The external filter must be cleaned regularly, otherwise it can become a source of nitrates. For its part, the skimmer will help remove organic waste from the water.
I would advise beginners to immediately purchase live stones. They actually have a lot of benefits. They look great, are a natural biological filter, in addition, some fish like to eat them, live inside, or hide behind them from prying eyes. And this is not a complete list of the advantages of living stones, there are others. Yes, and keeping a marine aquarium is much easier with these wonderful pebbles. In a nutshell about living stone
It is easier to change the water in a freshwater aquarium
Regular partial water changes in a freshwater aquarium are slightly different from the same process in a saltwater aquarium. Freshwater aquarium owners typically drain some water (say 10%) using a special hose and then top up with dechlorinated tap water or filtered water. If you carry out this procedure regularly, the condition of the aquarium will be excellent. Marine aquarium owners, on the other hand, cannot use a hose, since sea water must be mixed long before it is poured into the aquarium. To do this, you will have to use a bucket or a special storage tank, which can be placed directly in the aquarium cabinet.
Saltwater fish are generally more expensive than freshwater fish.
The first time you look into a pet store with marine fish, you can experience a real shock when you see the price tags. With the exception of the more common species, such as green chromis and other small pomaceous species, most fish cost $50 or more. Prices for marine invertebrates are also not weak, especially for those who live far from the coast, because the price includes transportation costs.
When buying, put the fish in a quarantine aquarium!
Huge selection of invertebrates
It feels like the number of marine invertebrates is completely unlimited. Of course, the owners of freshwater aquariums have a large enough choice, but it cannot be compared with the marine world. Just walk into a pet store, say whatever you want, and chances are the species you choose will be in stock, ranging from corals, clams, shrimp and worms, to starfish. It seems that the number of available marine invertebrate species is constantly increasing.
Marine fish have amazing colors
Of course, among freshwater fish there are very bright species, such as fighting fish, neon tetras, discus and others, but the marine world provides us with an incomparable variety of colors, the sight of some marine representatives is simply breathtaking. Consider that you have never seen yellow unless you have seen a flock of yellow zebras swiftly cut through the waters of an aquarium or gracefully swim among the reefs!
Briefly
So, the content of marine fish is more expensive and they require careful care. However, if a balance is found, care becomes much easier, and living stones make life much easier. In freshwater aquariums, a similar filtering function (but with less efficiency) is performed by living plants. If you have been into freshwater aquariums for some time now, the transition to saltwater aquariums will not be too difficult. If you have money, desire, and, most importantly, enough fortitude to take up the study of the marine world and its features, do not even hesitate! Buy a marine aquarium and soon you won't even be able to imagine how you lived without it before.
Good luck!
Our planet is called blue for a reason. In photographs from space, it is indeed blue. And all because three-quarters of its surface is covered with water - 361 million square meters. km is covered by the World Ocean - part of the water shell of the planet's hydrosphere. The hydrosphere is oceans, seas, rivers, lakes, ponds, swamps and even small springs. Everything is clear with rivers and lakes, but what is the difference between the sea and the ocean, do we swim in the sea or still in the ocean? Even the father of a third-grader can be puzzled by the question. Is the sea different from the ocean? Let's figure it out.
What are we talking about?
Everyone studied geography at school and remember that the World Ocean is divided into five oceans:
- Quiet or Veliky is the largest and oldest, its area is 178.6 million square meters. km;
- Atlantic - 92 million sq. km;
- Indian (ocean of ancient civilizations) - 76 million sq. km);
- Arctic - 15 million sq. km);
- Southern, about the boundaries of which scientists are still arguing - 86 million square meters. km).
It is clear with the oceans, what about the seas? What is the difference between the sea and the ocean, the photo below will not explain. Official geography reports that there are ninety seas on our planet, but disputes in scientific circles do not subside, and different numbers can be found in different sources. If experts argue, how can the layman understand?
The boundaries of the seas and oceans
By definition, an ocean is a body of water between continents. The sea is considered to be isolated water masses (land, islands, underwater ridges, etc.). The boundaries of the seas are often conditional, and on this basis, the seas are marginal (oceanic), interisland and closed (inland). With the boundaries of the second and third is more or less clear. But oceanic? These are the seas that are part of the ocean. Logical conclusion: the sea is smaller than the ocean. What is the difference between a sea and an ocean other than size?
Water and ecosystem indicators
What distinguishes the sea from the ocean is the chemical composition of the water. Oceanic seas differ from oceans in their special flow regime. The water in the sea, due to inflow from fresh water, is almost always less saline than in the ocean. Accordingly, its own ecosystem is created with its own flora and fauna. Although there is an exception - the Barents Sea. It has the most salty water, the percentage of salt in its water is 35%.
bottom quality
For oceanologists, the main thing in the question of how the sea differs from the ocean lies in the nature of the bottom surface. Oceans are characterized by the presence of oceanic crust. The bottom of the seas is always a shelf or slope of the continents, which repeats the geological structure of the mainland land. Exceptions are the Philippine and Sargasso Seas. These two bodies of water do not have land boundaries, they are located in the middle of the ocean and are separated from the waters of the ocean by underwater ridges.
Depth
Most seas are shallower than oceans. This is understandable, because they occupy the coastal zone of the continents. However, the "bottom" of the Earth - the Mariana Trench - is located in the Philippine Sea in the middle of the Pacific Ocean. This is a tectonic fault, the depth of which, according to 2009 data, is 10,902 meters below sea level, the maximum depth to which the Nereus underwater unmanned vehicle could then descend. The only apparatus in the world capable of withstanding pressure of 6,000 pascals at such a depth belongs to the American company WHO. By the way, the highest mountain on the planet, Everest, can easily fit in this hollow, and even with a margin of approximately one kilometer.
But even here there are exceptions. For example, the shallowest sea is the Sea of Azov. Its greatest depth is only 18 meters, the height of a six-story building. And it is also the most continental, which means that it is located very far from ocean waters. That is why it is one of the warmest.
Current differences
The difference between the ocean and the sea is in the quantity and quality of the currents. In the ocean there are surface warm and cold currents of water masses. They can find each other, intersect. The sea is characterized by the presence of one, either warm or cold current, with a clear route.
Waves of the seas and oceans
Everyone who has rested on the sea or the ocean has seen the waves and understands how the sea differs from the ocean. In the ocean, the waves are much larger. There is no calm on ocean beaches. And all because the wave in the ocean is not limited to the coastal zone and can gain great power. And if the ocean wave does not break on coral reefs near the coast, then this is where the paradise for surfers is located. The latest world record was set by American surfer Garret McNamara, who conquered a 34-meter high wave off the coast of Portugal in Nazar Bay, which is recognized as the generator of the highest waves not only in the Atlantic.
little confusion
Throughout the development of civilization, man has been in close contact with the coast of the water surface. And in the process of the development of navigation, when there was no oceanology yet, many water areas were given names that did not correspond to their geographical status. For example, the Mediterranean Sea includes the Tyrrhenian, Ionian, Adriatic, Balearic, Alboran, Cyprus, Levantine, Legurian Seas, although modern science considers them to be bays of the Mediterranean.
The Caspian and the Dead, which are large salt lakes, have also been named seas. But the Persian Gulf is the sea of the Indian Ocean, and the Mexican - the Atlantic.
Afterword
So, what will dad answer to a third grader when he asks how the sea differs from the ocean? Briefly, the answer may sound like this: apart from the size and pronounced restrictive boundaries, salinity of water and the composition of flora and fauna, the presence of various kinds of currents and geological features of the bottom, in general, almost nothing. Although swimming in ocean waters is always more dangerous than in more peaceful sea waters.
Fresh and sea water are sisters, but there are quite definite differences between them. Let's start with the fact that each of them has its own mission and role on our planet. Fresh reserves make up 2.5% of the total world resources - all the rest are in the bowels of the Earth. Since the need for drinking fresh water is only increasing every year, mass desalination of salty sea sources has been started. At the same time, both waters are close and are, in fact, different sides of the same phenomenon, Yang and Yin.
Interestingly, Cousteau, during his next sea voyage, discovered the border between these two sources - it runs very clearly off the coast of the Strait of Gibraltar at the junction with the Mediterranean Sea. The sea has a certain temperature, flora, fauna and composition. An interesting fact: sea and fresh water never mix, mainly due to the difference in density - a liter of ocean liquid is heavier than a liter of fresh water by about 25 g. This is not strange, since it contains a whole set of trace elements that add weight to salty liquid compared to not salty. Using special filters, these impurities can be separated.
To obtain fresh drinking water from salty sea water, the following methods can be used:
- Chemical - chemicals are introduced into the salty liquid, which, when they react with salts, begin to precipitate. The main disadvantage of this method is the high cost, distillation, and a long toxic process. The chemical method involves the use of distillers, distillation, evaporation and separation of liquids of different composition. In this case, the yield of demineralized water is maximized.
- Ionic - the desalinated liquid is passed through filters in which the exchange of water ions with the ion exchanger takes place. This method allows not only to desalinate the liquid, but also to obtain valuable minerals from it. The profitability of the process depends on the salt content in the water (and it can be different).
- Reverse osmosis - in this case, water is forced through a thin membrane (only a pure water molecule passes through the membrane, and impurities are retained). The advantages of the technique are minimal energy consumption, simplicity and compactness of the design, the ability to perform the process fully automatically.
- Freezing - ice from sea water turns out ... fresh. After the salt liquid is frozen, the ice is separated, washed and melted. The method is highly complex and costly, so it is used quite rarely. How to choose the right cleaning method? To do this, you need to know the indicator of heavy water and start from it, since an increased content of deuterium is very unhealthy and contributes to a change in the basic properties of water.
So far, the most efficient and at the same time low-cost desalination plant does not exist, but in the near future, we hope, this solution will be invented. Fresh water resources are constantly depleted, and the need for them is increasing - therefore, the task of creating an innovative desalination plant is very acute.
The use of high-quality drinking water in sufficient volumes is the key to health and well-being. If you don't drink enough, over time you may encounter a variety of problems. We advise you to purchase a dispenser for bottled water and order clean drinking water from mountain springs.
What is the difference between sea salt and ordinary table salt (table salt), there are several answers to this question. If we consider salt in its pure form, then there are practically no differences, except for the richer content of minerals in sea salt.
WHAT IS THE DIFFERENCE BETWEEN SEA SALT AND EDIBLE SALT
First of all, sea salt differs from rock salt (table salt) by the principle of its extraction and production. We recommend that you read
Sea salt - is produced by evaporating salt from sea water, followed by purification of the salt from impurities.
Rock salt - It is extracted from underground sources and, like sea salt, is purified from various impurities.
But in terms of taste, sea and rock salt differ depending on the place of extraction of salt and the quality of its purification from impurities. In some cases, sea salt can be saltier than rock salt, and in others it is the other way around.
Also, the difference between sea salt and rock salt may be that usually no additives are added to sea salt, but they are sold as it is after production, but iodine and an anti-caking agent are usually added to rock salt, which makes it useful due to the presence in salt iodine and harmful, crumbly due to the presence of an anti-caking agent. We recommend that you read
Also given that the extraction of sea salt in the process is more laborious than the extraction of rock salt, the difference between sea salt and food salt will be in price. You can see in the store how much sea and edible salt costs. Also, sea salt differs in price also because advertising marketing advertises it as more useful than rock salt.
