The earth is a beautiful planet, divided into land and sea. It is the existence of vast oceans that makes the earth a beautiful ecological planet and gradually evolved into a life planet. According to the research of scientists, the total area of the ocean is about 360 million square kilometers, accounting for 71% of the whole earth’s surface, while the land area accounts for only 29%, one third of which is desert.
The ocean is very important for the formation and stability of the earth’s ecology, and the earliest primitive life of the earth was born in the ocean 3.8 billion years ago. In the early days, there were no terrestrial organisms on the earth. Later, when marine organisms developed to a certain stage, some of them became amphibians and began to move towards the land before they gradually evolved into terrestrial organisms.
So, essentially, all life on land originated in the ocean. After entering the era of science and technology, with the help of science and technology, human beings began to explore the land and sea constantly. After continuous exploration and research, at present we have a good understanding of 90% of the land area, but for the vast ocean, we still know less than 10%.
The most difficult area to explore in the ocean is naturally the deep sea. The average depth of the earth’s ocean is about 3795 meters, and the deepest place can reach 11000 meters, which is known as the Mariana Trench. The Mariana Trench, also known as the Mariana Trench, is located at the bottom of the Pacific Ocean near the Mariana Islands in the northeast of the Philippines. It starts from iwang island in the north and ends at Yap Island in the southwest, with a total length of about 2550 km.
According to the research of scientists, this trench has been formed for 60 million years, which is very close to the extinction time of dinosaurs, so we speculate that its formation may be related to the fifth mass extinction. It is possible that the impact of an asteroid caused a great shock to the earth’s plate. With the extinction of dinosaurs, the Mariana Trench was formed.
Mariana Trench is a very unstable area, where all kinds of earthquakes often occur. So what are the secrets hidden in such a deep ocean? As the deepest ocean location on earth, the Mariana Trench naturally attracts scientists’ infinite interest. Perhaps we can have a deeper understanding of the ocean by solving the mystery here.
In exploring the Mariana Trench, what scientists want to understand most is whether there will be life here. We need to know that according to the past cognition of scientists, life is difficult to survive in the very deep sea, and through the understanding of marine life, life is basically concentrated in an area of more than 1000 meters.
Once the water depth exceeds 1000 meters, with the increasing of the depth, the species and quantity of marine life are also decreasing, especially when it reaches the water layer below 7000 meters, it is difficult to see organisms. Scientists have found 18 cm new fish species in the water layer of 8000 meters. It can be seen that the depth of the sea is not completely a forbidden zone for life, where there is still life.
Scientists have found a fish on the 8145 meter seabed of the Mariana Trench, nearly 500 meters deeper than previously recorded. So in deeper areas, even the deepest 11000 meters in Mariana, will there be life? It has not been found yet. Of course, it is not that there is no life at this depth. It is just that it is difficult to explore the entire Mariana Trench with human technology. The pressure there is too strong.
Although scientists did not find life in the deepest part of the Mariana Trench, they found something unexpected. And these things are also things that scientists used to worry about. Now they have finally appeared. For human beings, the discovery of these things is not good news. So what worries scientists?
In fact, the things that appear in the Mariana Trench are ubiquitous in our daily life. They are ubiquitous plastic waste, also known as white pollution. Plastic products have become the indispensable daily necessities of human society, not daily shopping or other daily necessities. Many of them are inseparable from plastic, which is the most important thing of human beings.
Plastic is a kind of high molecular polymer, which is very difficult to degrade in nature. When we throw plastic out of the field, even after hundreds of years, it can still exist. Therefore, white pollution has become the most influential one among all kinds of human pollution, and it has a greater and greater impact on human life.
It is difficult to decompose plastics, and it is also very difficult to recycle and treat them collectively. Therefore, a large amount of plastic waste is either buried deep underground, or poured into the ocean gradually with the waves. In the Pacific Ocean, there is an “island” composed of plastic waste, covering an area of 140 square kilometers, and it continues to expand at a very fast speed.
This garbage island is formed by the aggregation of plastic garbage from all over the world under the action of ocean current, which is called “the Eighth Continent”. The impact of large pieces of plastic waste on human beings is not terrible, because we can see them and will not eat them by mistake. However, micro plastic is something we can hardly see. It can be hidden in the body of animals and eaten by humans.
In the bottom water of 2673-10908m of Mariana Trench, scientists found that the content of microplastics is 2.06-13.51/l, and in the surface sediment of 5108-10908m of Mariana Trench, the content of microplastics is 200-2200 / L, which is significantly higher than that in most deep-sea sediments.
Plastic has been found in the depth of Mariana Trench, which shows that the whole ocean is more and more polluted by plastic. The ocean not only plays an important role in regulating the ecological environment, but also is the source of a large number of seafood. A large part of the seafood people eat every year comes from the ocean.
If the ocean is polluted by plastics, a large number of micro plastics will enter the body of marine organisms, and with the human consumption of seafood, it will enter the human body. Scientists have found that the content of micro plastics in the human body is also increasing, which is one report after another. Human beings have developed plastics and put them into nature in large quantities, and nature will eventually return these plastics to human beings, posing a threat to our health.