World ocean and its properties
The ocean covers about 70% of the surface of our planet. Thus, it is an aquatic membrane, stretched almost all over the surface of the Earth. The oceans are continuous, and wash areas of land on all sides, be it continents, or islands.
The ocean on the map
The author of the photo is Link576, the link to the original (photo has been changed).
Parts of the world ocean
In these same land of land, the world’s ocean is divided into 4 huge parts, which are called oceans. Each of them has its own characteristics, and, of course, its name: the Atlantic Ocean, the Indian Ocean, the Pacific Ocean, the Arctic Ocean. In addition, the fifth ocean, Southern, is also distinguished from the others. They study oceanology science.
Some parts of the ocean are separated from it by land or underwater relief. As a rule, they have different temperature, salinity level and other indicators. These parts are called seas. They are located near the land, and in some cases they may even be on the mainland, and not have communications with the oceans. In other words, the sea is a very large salty lake, which may not have clear boundaries, but just go somewhere to the ocean.
Also important part of the World Ocean are the bays and straits.
As we already know, water wash the continents from all sides. And not everywhere, the coastline is an even lane. There are many areas where the seas and oceans are deeply deployed in land, while maintaining free water exchange. Such parts of the ocean are called bays.
Well and besides everything else, there are also straits. They are also an integral part of the world’s oceans. After all, straits are water spaces connecting adjacent water basins (and their parts), and thus clogged between two parts of the land.
Interesting ocean phenomena
1. In some places at the bottom of the oceans there are cracks. Through them, various substances are leaked: methane, hydrogen sulfide and others. After this, the substance is mixed with water, and float along the ocean floor, like rivers. Underwater rivers, sounds great, right? This phenomenon is called cold leakage.
Photo by NOAA Photo Library, link to the original (photo has been changed).
2. One more miracle of the world ocean are underwater waterfalls. They are formed due to the difference in temperature and salinity of water, as well as the complex relief of the bottom. Such waterfalls represent huge masses of denser water, which jump sharply downwards, and substitute for less dense water. In total, underwater falls are less than a dozen, although their count can go on hundreds.
Photo by Cristian Bortes, link to the original (photo has been changed).
3. Depths of the ocean can be recognized by acoustic sounding (sound waves). In the middle of the 20th century, it became known that such a method could fail. Then the “bottom” was discovered at a depth of 400 meters (incredible!). And later it became clear at all that this “bottom” then rises to the surface, then goes down into the depths. Already later, after various studies, it became clear that this effect was achieved thanks to the squid. They can move in dense groups, in which individuals are evenly distributed. Because of this, there is a false bottom.
4. Sometimes there are very large luminous areas in the oceans. They are called dairy seas. It is believed that this glow arises due to luminescent bacteria, but it is credible to assert it is too early.
5. Ocean currents are streams of water moving in the oceans on certain routes. Moving huge masses of water, they have a great influence on the formation of the global climate. This is especially true of the coastal parts of the continents.
The living world of the oceans
The oceans, to date, are one of the least studied parts of the Earth. According to the most optimistic assertions, only about 5% of the world’s oceans are studied. But even these 5% make it possible to imagine how diverse and interesting the underwater world of the oceans is.
The oceans inhabit many living organisms. Known to the science of them is about 200 thousand species, but research shows that it is only a tenth. Thus, we can only imagine what the remaining 2 million species of organisms represent. What incredible animals hide in the ocean depths? If we rely on already known information, then imagination can make us very far away.
Most deep-sea fish (inhabiting more than 1 km in depth) have relatively small eyes (or do not have them at all), because there is almost no light there. They also lead a virtually immobile way of life, trying to save energy in this way. After all, food at such depths for them almost no. And therefore, by the way, most of the deep-sea fish are quite small. Big ones simply will not be able to feed. But small ones they are small, but they can eat more than weigh themselves, because of which they have a very swollen belly. Imagine such swallows? And still they are able to fish,