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Video: A Deep Dive Into the World’s Oceans

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In the battle for mind-share, space vs. sea is no contest.

From the epic race to reach the surface of the moon, to the well-documented trials and tribulations of SpaceX’s rocket launches, space is widely regarded as mankind’s natural next step.

For centuries, we’ve gazed at the night sky attempting to decode the messages of the cosmos, but we’ve treated the ocean as a dumping ground or as a nemesis. In the era of big data, it’s strange to note that an estimated 95% of the world’s oceans still remain unexplored.

A Deep Dive Into the World’s Oceans

Today’s video, from Tech Insider, helps shed some light on just how deep the ocean is, and put that depth into a context us surface-dwellers can understand.

The ocean is vast, but looking at it in terms of light and food supply allows us to better understand the structure of that ecosystem.

There are five main oceanic divisions:

Ocean ZoneDepth (m)Depth (ft)
epipelagicSurface to 200 mSurface to 650 ft
mesopelagic200 to 1,000 m650 to 3,300 ft
bathypelagic1,000 to 4000 m3,300 to 13,000 ft
abyssopelagic4,000 to 6,000 m13,000 to 20,000 ft
hadopelagic6,000 to 11,000 m20,000 to 36,000 ft

Let’s take a look at each layer in more detail.

Scratching the Surface

The surface layer of the ocean, or epipelagic zone, is the portion we’re most familiar with. This portion of the ocean is amply lit by the sun, and though it’s the smallest zone by volume, it contains much of the ocean’s life. In fact, the phytoplankton living at this level produce half of the world’s oxygen.

One of the chief concerns about climate change is that acidification and temperature changes may dramatically influence levels of phytoplankton in the ocean, thus putting Earth’s largest source of oxygen in jeopardy.

Due to its proximity to sunlight, this layer of the ocean is the fuel that feeds the rest of the ocean. As organisms die, they begin to sink to the lower depths in the form of “marine snow”. This is vital since plant life cannot survive beyond this thin, top layer of water. Put simply, the epipelagic zone feeds the rest of the ocean.

The Twilight Zone

The next layer, called the mesopelagic zone, begins 200m below the surface and extends down to the 1km level. At this point, sunlight illuminating the water begins to wane and water pressure already begins to push beyond what the human body can tolerate.

This dimly lit zone is where we begin to see evolutionary adaptations such as bioluminescence. Large fish and whales also enter this zone to hunt for food.

Hello Darkness, My Old Friend

At 1km below the surface – in the bathypelagic zone – sunlight has faded completely and the ocean is nearly pitch black. This region accounts for 90% of the ocean’s volume and as the video below (via TEDed) explains, this is where things start to get really weird.

The Abyss

The aptly named abyssopelagic zone, begins at 4,000 meters below the surface and extends down to 6,000 meters (or the ocean floor). At this level, the water temperature is nearly at freezing level, and because no sunlight reaches this zone, many of the animals that live here are sightless. The Abyss is the largest zone in the ocean, accounting for about 75% of the ocean floor and 54% of the ocean’s volume.

abyssal plain ocean topography

This region of the ocean is the home of the Abyssal plains. The plains are the upper surface of sediment that has accumulated in abyssal depressions, smoothing out what would otherwise by irregular topography. By this depth the consistent flow of marine snow has decreased dramatically, so organisms depend on occasional “feasts” to survive. Occasionally, events such as large algae blooms near the surface end up delivering huge amounts of food to the ocean floor once those blooms die off.

Abyssal plains could eventually become a big deal economically due to hydrocarbon exploration and mineral extraction. An example of the latter is polymetallic nodules. These potato-sized concretions are scattered around the seafloor at depths greater than 4,000 meters. If it becomes economically viable to harvest these nodules (comprised of manganese, iron, nickel, cobalt, and copper), companies could generate considerable revenue. Currently, there are eight commercial contractors licensed by the International Seabed Authority to explore the extraction of nodule resources.

Earth’s Final Frontier

The hadopelagic zone comprises less than 1% of ocean volume and 0.2% of the seafloor, but looms large as one of Earth’s least understood ecosystems. In fact, more humans have been on the moon than have visited this area of the ocean, and most of this zone only exists within deep water trenches and canyons that extend well beyond the Abyssal plains. There are 33 “hadal trenches” and five of them exceed 10,000 meters – including the world’s deepest oceanic point, the Mariana Trench.

The water pressure here can reach a mind-bending eight tons per square inch, but in spite of the extreme pressure, lack of food, and near-freezing temperatures, life can still be found. Most of the creatures that inhabit the hadal zone are literally bottom feeders; they eat the very last bits of marine snow that reach the trench floor.

While nearly all organisms on Earth derive energy either directly or indirectly from the sun, certain organisms have adapted to survive by using hydrothermal vents as an energy source. Many of the creatures living around vents contain symbiotic bacteria, which subsist off hydrogen sulphide emissions. This unique ecosystem provides clues for how life could exist on other planets with more extreme ecosystems.

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Markets

Ranked: The Best and Worst Pension Plans, by Country

As the global population ages, pension reform is more important than ever. Here’s a breakdown of how key countries rank in terms of pension plans.

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Ranked: Countries with the Best and Worst Pension Plans

The global population is aging—by 2050, one in six people will be over the age of 65.

As our aging population nears retirement and gets closer to cashing in their pensions, countries need to ensure their pension systems can withstand the extra strain.

This graphic uses data from the Melbourne Mercer Global Pension Index (MMGPI) to showcase which countries are best equipped to support their older citizens, and which ones aren’t.

The Breakdown

Each country’s pension system has been shaped by its own economic and historical context. This makes it difficult to draw precise comparisons between countries—yet there are certain universal elements that typically lead to adequate and stable support for older citizens.

MMGPI organized these universal elements into three sub-indexes:

  • Adequacy: The base-level of income, as well as the design of a region’s private pension system.
  • Sustainability: The state pension age, the level of advanced funding from government, and the level of government debt.
  • Integrity: Regulations and governance put in place to protect plan members.

These three measures were used to rank the pension system of 37 different countries, representing over 63% of the world’s population.

Here’s how each country ranked:

CountryOverall ValueAdequacySustainabilityIntegrity
Argentina39.543.131.944.4
Australia75.370.373.585.7
Austria53.968.222.974.4
Brazil55.971.827.769.8
Canada69.27061.878.2
Chile68.759.471.779.2
China48.760.536.746.5
Colombia58.461.44670.8
Denmark80.377.58282.2
Finland73.673.260.792.3
France60.279.14156.8
Germany66.178.344.976.4
Hong Kong61.954.554.586.9
India45.839.944.956.3
Indonesia52.246.747.667.5
Ireland67.381.544.676.3
Italy52.267.41974.5
Japan48.354.632.260.8
Korea49.847.552.649.6
Malaysia60.650.560.576.9
Mexico45.337.557.141.3
Netherlands8178.578.388.9
New Zealand70.170.961.580.7
Norway71.271.656.890.6
Peru58.56052.464.7
Philippines43.73955.534.7
Poland57.462.545.366
Saudi Arabia57.159.650.562.2
Singapore70.873.859.781.4
South Africa52.642.34678.4
Spain54.77026.969.1
Sweden72.367.57280.2
Switzerland66.757.665.483
Thailand39.435.838.846.1
Turkey42.242.627.162.8
UK64.46055.384
U.S.60.658.862.960.4

The Importance of Sustainability

While all three sub-indexes are important to consider when ranking a country’s pension system, sustainability is particularly significant in the modern context. This is because our global population is increasingly skewing older, meaning an influx of people will soon be cashing in their retirement funds. As a consequence, countries need to ensure their pension systems are sustainable over the long-term.

There are several factors that affect a pension system’s sustainability, including a region’s private pension system, the state pension age, and the balance between workers and retirees.

The country with the most sustainable pension system is Denmark. Not only does the country have a strong basic pension plan—it also has a mandatory occupational scheme, which means employers are obligated by law to provide pension plans for their employees.

Adequacy versus Sustainability

Several countries scored high on adequacy but ranked low when it came to sustainability. Here’s a comparison of both measures, and how each country scored:

Ireland took first place for adequacy, but scored relatively low on the sustainability front at 27th place. This can be partly explained by Ireland’s low level of occupational coverage. The country also has a rapidly aging population, which skews the ratio of workers to retirees. By 2050, Ireland’s worker to retiree ratio is estimated to go from 5:1 to 2:1.

Similar to Ireland, Spain ranks high in adequacy but places extremely low in sustainability.

There are several possible explanations for this—while occupational pension schemes exist, they are optional and participation is low. Spain also has a low fertility rate, which means their worker-to-retiree ratio is expected to decrease.

Steps Towards a Better System

All countries have room for improvement—even the highest-ranking ones. Some general recommendations from MMGPI on how to build a better pension system include:

  • Increasing the age of retirement: Helps maintain a more balanced worker-to-retiree ratio.
  • Enforcing mandatory occupational schemes: Makes employers obligated to provide pension plans for their employees.
  • Limiting access to benefits: Prevents people from dipping into their savings preemptively, thus preserving funds until retirement.
  • Establishing strong pension assets to fund future liabilities: Ideally, these assets are more than 100% of a country’s GDP.
  • Pension systems across the globe are under an increasing amount of pressure. It’s time for countries to take a hard look at their pension systems to make sure they’re ready to support their aging population.

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Maps

Animated Map: The History of U.S. Counties

This video highlights the history of American counties, and how their boundaries have changed over the last 300 years.

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Animated Video: The History of U.S Counties

Did you know that there are 3,142 different counties in the U.S. today?

Going as far back as the 1600s, English settlers arriving in the New World envisioned counties as a means of accessible government—a county seat was meant to be within a day’s buggy ride for every citizen.

While the role of counties in local government has remained significant in modern times, their boundaries have changed drastically over the years.

This animated map by Alexander Varlamov visualizes the history of U.S. county borders, and how these jurisdictions have evolved over time.

County Equivalents

Before diving in, it’s important to note a few county-equivalents that function similarly but go by different names:

  • Boroughs/Census areas: Alaska is made up of 19 boroughs, but the majority of its landmass is not included in them. Rather, it’s officially labeled by the Alaskan government as the unorganized borough.
  • Parishes: Instead of counties, Louisiana uses the term parishes because of its French and Catholic heritage.
  • Independent cities: These are cities that operate outside their surrounding county’s jurisdiction. There are 41 independent cities in the U.S. and 38 of them are in Virginia.

Over 300 Years of Growth

The number of counties in the U.S. has increased dramatically since the early days of American history. Here’s a look at their growth since 1790:

YearNumber of Counties and Parishes
1790292
18501621
18702247
19002713
19203041

The first county was established in 1634, over 100 years before the first Census was taken (and long before America gained independence). It was created in James City, Virginia—an interesting location, considering Virginia now has the highest concentration of independent cities.

Why does Virginia have so many independent cities? The state’s separation of counties and cities dates back to the early 1700s. With a rural population and low productivity, it was difficult to establish town centers. After several attempts, the General Assembly gave up. Independent cities were established instead.

Short-lived Counties

Counties as a political organization have been around for hundreds of years, but some individual counties haven’t lasted long.

For instance, Bullfrog County in Nevada was established in 1987 and dissolved just two years later. During its brief existence, it had no population and no infrastructure—and its primary purpose was simply to prevent Yucca Mountain from becoming a nuclear waste dump.

While Bullfrog County has since been dissolved, the controversy around the nuclear waste site is ongoing as of 2020.

Continual Change

The latest official county, Broomfield Country, was established in Colorado in 2001.

Although it’s been decades since the last county was created, there have been continual boundary changes and status updates—sometimes for political reasons. For instance, the Supreme Court recently ruled that half of Oklahoma is within a Native American reservation. While this doesn’t necessarily change ownership, it does affect jurisdiction and county authority.

Though the lines on the map are more or less static now, the invisible lines of county jurisdiction will continue to change and evolve over time.

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