Oceanic graves: What are they, how they form, examples and what is the deepest

Oceanic graves, also known as marine graves, are narrow and elongated depressions found at the bottom of the ocean. They are some of the deepest and most mysterious formations of our planet. They are formed in areas where a tectonic plate slides below another, in a process known as subduction. This movement makes the sea soil sink and give rise to these huge cavities.

The conditions are extreme: Darkness is total, temperatures are very low and the pressure is immense. Even so, life has found a way to adapt, and inside they live creatures that are still surprising for science.

What is the difference between an oceanic pit and an oceanic dorsal?

An oceanic pit is a Very deep depression At the bottom of the ocean that is formed when a tectonic plate sinks under another in a process called subduction. These graves are usually close to the continental edges and represent the deepest areas of the ocean.

On the other hand, an oceanic dorsal is a Submarine mountain chain That appears where two tectonic plates separate, allowing magma to rise and form new oceanc crust. The dorsals are generally found in the center of the oceans and are areas of constant marine background formation.

In summary, the graves are deep sinks caused by the subduction, while the dorsals are elevations formed by the creation of new cortex when the plates are separated.

Oceanic graves have a series of characteristics that make them unique within the underwater landscape.

• First, they stand out for their Great depthsince more than 6,000 meters are usually found below sea level, and some, such as the Mariana pit, exceed 11,000 meters. This depth generates an environment very different from other areas of the ocean.
• One of the main characteristics is The pressure In an oceanic pit. As it descends in the ocean, the pressure increases considerably, and at the bottom of a pit can be more than a thousand times greater than atmospheric pressure at sea level. This extreme pressure makes only certain very adapted organisms can survive in these conditions.
• Another important feature is The temperature In an oceanic pit, which is usually very low, generally close to 0 ° C. Due to the lack of sunlight and great depth, water in these areas remains cold throughout the year, which also influences the type of life that can be developed there.
• In addition, oceanic graves are usually surrounded by geological activity. It is not uncommon to find in its vicinity submarine earthquakes and, in some cases, submarine volcanoes. These formations are silent witnesses of the movements of the tectonic plates that have shaped the earth for millions of years.

Oceanic graves are formed through a geological process known as subductionwhich occurs in the limits of tectonic plates. The earth’s lithosphere is divided into large blocks that move slowly over the mantle. When two tectonic plates are found, it can happen that one of them, usually the oceanic because it is denser, slips below the other and sinks into the terrestrial mantle.

This descent from one plaque under another Create a deep cleft at the bottom of the ocean: an oceanic pit. The process is not fast or simple, but it can take millions of years to develop, but over time it is shaping the relief of the seabed.

A clear example of this type of formation is the aforementioned Plan of the Mariana, which was formed when the Pacific plate began to subduct under the Mariana plaque. This tectonic interaction is still active today, which means that the pit continues to change slowly over time.

In addition to generating graves, the subduction can also cause earthquakes and form underwater mountain ranges or volcanic islands nearby. Therefore, many graves are found in regions with high seismic and volcanic activityas the so -called Pacific Fire Ring.

The deepest oceanic pit of the world is the Mariana pitlocated in the Western Pacific Ocean, east of the Mariana Islands. Within this pit is the nest known point of the oceans: the Challenger abysswhich reaches an approximate depth of 11,034 meters below sea levelalthough some recent measurements place it slightly above or below that figure. To have an idea of its magnitude, if we placed Mount Everest (with its 8,848 meters high) inside the Challenger abyss, there would still be more than 2,000 meters of water above its top.

The Mariana pit is an extremely inhospitable place. The pressure in an oceanic pit like this is huge, more than 1,000 times atmospheric pressure. In addition, the temperature in an oceanic pit like that of the Mariana is around 1 or 2 ° C, which contributes to a cold, dark and high pressure environment where life is only possible for highly specialized organisms.

In addition to the famous Mariana pit, there are many other oceanic pits in the world that also reach impressive depths and are part of the most active and complex areas of the seabed. These formations are distributed mainly in the Pacific and Atlantic oceans, and all originate from the same tectonic subduction process:

• Tonga pit: located in the South Pacific. It is one of the deepest oceanic graves, with a depth that exceeds 10,800 meters, which makes it the secondest deepest on the planet after that of the Marianas.
• Philippines: It is also found in the Western Pacific and reaches depths close to 10,500 meters. This area is highly seismic and volcanic due to the constant movement of tectonic plates in the region.
• Puerto Rico pit: It is found in the Atlantic Ocean and is the deepest of that ocean, with approximately 8,400 meters deep. This pit is not only important from the geological point of view, but also represents a seismic risk area for the nearby islands.

Other notable examples include Kermadec pit (New Zealand), La Java pit (Indonesia) and the Kuriles (Russia), all of them belonging to the so -called Pacific Fire Ring, a region that concentrates many of the deepest oceanic graves in the world.

Oceanic graves house a unique fauna adapted to extreme conditions: total darkness, temperatures close to the freezing point and overwhelming pressure. Despite these difficulties, many organisms have evolved to survive in these depths. Among the most representative animals are Abyssal fishlike him dragon fish and the Viper fishas well as various species of crustaceans, marine worms and mollusks. Giant amphipods and Extremophile microorganisms that live in the sediments of the background. Many of these beings have gelatinous bodies, bioluminescence and very specialized hunting mechanisms, since they must make the most of the scarce resources available.

We recommend reading this article about extremophiles: what are, characteristics and examples.

The oceanic graves, although away from the surface, are not exempt from both natural and caused by the human being.

• Seismic and volcanic activity: The graves are found in subduction areas, where submarine earthquakes and volcanic eruptions can occur that, in turn, can generate tsunamis.
• Extreme conditions: Huge pressure, total darkness and low temperatures make exploring these areas extremely difficult and dangerous for human technology.
• Human pollution: Despite its depth, waste such as plastics, microplastics and heavy metals have been found in many oceanic graves, affecting the abyssal fauna.
• Unknown Environmental Impact: Altering these ecosystems so fragile and little studied could have negative consequences for the balance of the ocean, even if we still do not fully understand their reach.

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