Draining the World’s Oceans to Visualize Earth’s Surface
Although many maps of our planet go into great topographical detail on land, almost two-thirds of the Earth’s surface is covered by the world’s oceans.
Hidden from sight lie aquatic mountain ranges, continental shelves, and trenches that dive deep into the Earth’s crust. We might be familiar with a few of the well-known formations on the ocean floor, but there’s a whole detailed “world” that’s as rich as the surface, just waiting to be explored.
This animation from planetary researcher James O’Donoghue of the Japan Aerospace Exploration Agency (JAXA) and NASA simulates the draining the world’s oceans to quickly reveal the full extent of the Earth’s surface.
How Deep Does the Ocean Go?
Above sea level, Earth’s topography reaches all the way up to 8,849 meters (29,032 ft) to the top of Mt. Everest. But going below sea level, it actually goes deeper than the height of Everest.
Open ocean is called the pelagic zone, which can be broken down into five regions by depth:
- 0m–200m: Epipelagic (sunlight zone). Illuminated shallower waters that contain most of the ocean’s plants and animals.
- 200m–1,000m: Mesopelagic (twilight zone). Stretches from where 1% of surface light reaches to where surface light ends. Contains mainly bacteria, as well as some large organisms like the swordfish and the squid.
- 1,000m–4,000m: Bathypelagic (midnight zone). Pitch black outside of a few bioluminescent organisms, with no living plants. Smaller anglerfish, squid, and sharks live here, as well as a few large organisms like giant squid.
- 4,000m–6,000m: Abyssopelagic (abyssal zone). Long thought to be the bottomless end of the sea, the abyssal zone reaches to just above the ocean floor and contains little life due to extremely cold temperatures, high pressures, and complete darkness.
- 6,000m–11,000m: Hadopelagic (hadal zone). Named after Hades, the Greek god of the underworld, the hadal zone is the deepest part of the ocean. It can be found primarily in trenches below the ocean floor.
To put ocean depths into context, the bottom of the ocean is more than 2,000m greater than the peak of Mount Everest.
What “Draining” the World’s Oceans Reveals
For a long time, the ocean floor was believed to be less understood than the Moon.
The sheer depth of water made it difficult to map without newer technology, and the tremendous pressure and extreme temperatures make navigation grueling. A manned vehicle reached the deepest known point of the Mariana Trench—the Challenger Deep—in 1960, almost 90 years after it was first charted in 1872.
But over the last few decades, humanity’s understanding and exploration of the ocean floor has grown in leaps and bounds. O’Donoghue’s animation shows just how much detail we’ve been missing.
The first easily noticeable characteristic is the Earth’s continental shelves, which appear quickly. Most are visible by 140 meters, though the Arctic and Antarctic shelves are far deeper.
The animation then speeds up, as thousands of meters of depth reveal the tops of small mountain ridges and aquatic islands. From 2,000 to 3,000 meters, mid-ocean ridges appear that span the length of the Arctic, Pacific, and Indian oceans.
From 3,000 to 6,000 meters of ocean drained, these aquatic mountains slowly give way to the vast majority of the ocean floor. Little changes over the final 5,000 meters except to illustrate just how deep the ocean’s trenches reach.
Of course, technically the bottom of the Challenger deep is the deepest known point of the Mariana Trench. As satellite and imaging technology improves further, and aquatic mapping voyages become more possible, who knows what else we’ll discover beneath the waves.
This article was published as a part of Visual Capitalist's Creator Program, which features data-driven visuals from some of our favorite Creators around the world.
Visualized: What Lives in Your Gut Microbiome?
The human gut microbiome contains a world of microbes. We look at the the bacteria that deeply affect our health and well-being.
Visualized: What Lives in Your Gut Microbiome
Inside all of us lies a complex ecosystem of microbes. It includes bacteria, fungi, and even viruses that live in virtually every part of our bodies.
Researchers are continuing to discover how deeply connected our overall gastrointestinal health—gut health—is to these microbes.
Because bacteria outnumber all other microbes, we take a look at which ones live inside of us and what they do.
The Bacteria of the Gut Microbiome
The gut microbiome is composed of six main types of microbes. Each of these types of microbes has a unique function and role within the human body:
- Firmicutes: Firmicutes break down complex carbohydrates and produce short-chain fatty acids for energy. They help maintain the functioning of the gut barrier, which obstructs bacteria, harmful microorganisms, and toxins from entering the bloodstream through the intestinal tracks. Firmicutes are also linked to obesity and metabolic disorders when imbalanced.
- Actinomycetota: Actinomycetota break down complex carbs and produce vitamins B12 and K2, which are crucial for calcium absorption and energy generation in the body. They also protect the gut from harmful pathogens.
- Pseudomonadota: Pseudomonadota lowers the gut’s redox potential, a measure of the balance between oxidants and antioxidants in the gastrointestinal tract. This is important for breaking down, storing, and using energy. They do this by producing short-chain fatty acids and breaking down complex molecules, promoting the growth of other beneficial gut microbes.
- Fusobacteriota: Fusobacteriota can activate inflammatory responses to fight pathogens. But when imbalanced, they can contribute to inflammation and disease, such as periodontal disease.
- Bacteroides: Bacteroides break down complex carbohydrates, regulate the immune system, and produce vitamins and metabolites important for overall health in the human gut microbiome.
- Other: The “other” category includes a diverse range of microbes that contribute to various functions within the gut. These include various types of bacteria including TM7 (oral bacteria), cyanobacteria, acidobacteria, and verrucomicrobiota.
Dynamic Composition of the Microbiome
Interestingly, the proportions of these six microbe populations vary throughout the gastrointestinal tract.
|Section of Gut Microbiome
|Exponential Microbial Population (CFU/ml)
|Duodenum (Small Intestine)
|Jejunum (Small Intestine)
|Ileum (Small Intestine)
The presence, absence, and dominance of each of these microbes is based on their functionality. For example, in the mouth and esophagus, the microbial populations are relatively low. But the dominant microbe found here, Firmicutes, helps begin the process of breaking down sugars and carbohydrates from ingested food.
Meanwhile, the stomach is a harsh environment, with low pH levels that limit microbial growth. A small population of microbes is still present here.
The microbial population becomes more diverse in the small intestine. Here, Firmicutes and Actinomycetota are the dominant species, but Bacteroides and other microbes begin to make up a more substantial portion of the population.
The microbial population further diversifies in the large intestine, with Bacteroides and other microbes making up the majority of the population.
These proportions of bacteria in the gut microbiome represent the typical ratios for the average human body. But they can be influenced by factors including medical history, diet, age, and even geographical location.
The Gut-Brain Axis
The six microbe populations have effects way outside the gastrointestinal tract too.
The Gut-Brain Axis is a two-way link between the gut and the brain. This connection involves physical pathways and various forms of communication, including hormones, metabolism, and immunity.
Through these connections, the gut sends the brain signals when troubled. A distressed stomach or intestine is linked to anxiety, stress, depression, and other mental health issues. Irritable bowel syndrome (IBS) is another example of a disease influenced by the gut microbiome.
At the same time, the brain also signals the gut when distressed. Scientists believe that emotions like anger, anxiety, sadness, and happiness trigger gut issues.
Towards a Healthy Gut
The gut is known as our body’s “second brain” and more and more people are now paying close attention to their gut health.
Over the last two decades, we’ve gained a better understanding of how the microbiome affects human health. One example of this is the gut-brain axis. Changes in the microbiome have also been connected to various diseases.
Understanding this microbiome has opened up new opportunities in medicine and healthcare, as the knowledge of the role of every microbe could also uncover new treatments for illnesses linked to it.
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