1 Billion Years of Tectonic Plate Movement in 40 Seconds
According to plate tectonic theory, the Earth’s surface is made up of slabs of rock that are slowly shifting right under our feet.
Because of this constant movement, today’s Earth looks a lot different from what it did millions of years ago. Today’s animation looks at the Earth’s tectonic plate movement from 1 ga (geological time for 1 billion years ago) to the present-day, via EarthByte on YouTube.
Editor’s note: The video starts at time 1,000 ma (1,000 million years ago), and ticks down at the rate of about 25 million years every second.
The Emergence of Plate Tectonic Theory
Plate tectonics is a relatively new theory—in fact, according to National Geographic, it hadn’t become popular until the 1960s. However, the concept of continental movement was brewing long before it became widely accepted.
In 1912, German scientist Alfred Wegener proposed a theory he called continental drift. According to Wegener’s theory, Earth’s continents once formed a single, giant landmass, which he called Pangaea.
Over millions of years, Pangaea slowly broke apart, eventually forming the continents as they are today. Wegener believed this continental drift explained why the borders of South America and Africa looked like matching puzzle pieces. He also pointed to similar rock formations and fossils on these two continents as proof to back his theory.
Initially, the scientific community wasn’t on board with the theory of continental drift. But as more data emerged over the years, including research on seafloor spreading, the theory started to gain traction.
The Supercontinent Cycle
Nowadays, it’s believed that Pangea was just one of several supercontinents to mass together (and break apart) over the course of geological history.
The exact number of supercontinents is largely debated, but according to the Encylopedia of Geology, here are five (including Pangea) that are widely recognized:
- Kenorland: 2.7-2.5 billion years ago
- Nuna/Columbia: 1.6-1.4 billion years ago
- Rodinia: 950–800 million years ago
- Pannotia: 620-580 million years ago
- Pangea: 325-175 million years ago
According to the theory, this cycle of breaking apart and coming together happens because of subduction, which occurs when tectonic plates converge with one another.
The supercontinent cycle also ties into ocean formation. The below example of the Wilson Cycle specifically keys in on how the Atlantic Ocean, and its predecessor, the Iapetus Ocean, were formed as supercontinents drifted apart:
Source: Hannes Grobe
The Importance of Plate Tectonics
Plate tectonics has been a game-changer for geologists. The theory has helped to explain tons of unanswered geological questions, assisting scientists in understanding how volcanoes, mountains, and ocean ridges are formed.
It’s also valuable for the oil and gas industry since it explains how sedimentary basins were created, allowing geologists and engineers to target and locate vast oil reserves.
Since the theory of plate tectonics is relatively new, there’s still a lot to be discovered in this field of research. However, in March 2021, a report was published in Earth-Science Reviews that, for the first time, visualized a continuous plate model that shows how Earth’s plates have shifted over the last billion years.
The video above visualizes this particular report and accurately depicts the Earth’s tectonic plates’ movement or the observed shift in Earth’s tectonic plates over the years.
Mapping The Biggest Companies By Market Cap in 60 Countries
Tech, finance or energy giant? We mapped the biggest companies by market cap and industry.
The Biggest Companies By Market Cap in 60 Countries
Tech giants are increasingly making up more of the Fortune 500, but the world’s biggest companies by market cap aren’t so cut and dry.
Despite accounting for the largest market caps worldwide—with trillion-dollar companies like Apple and contenders including Tencent and Samsung—tech wealth is largely concentrated in just a handful of countries.
So what are the biggest companies in each country? We mapped the largest company by market cap across 60 countries in August 2021 using market data from CompaniesMarketCap, TradingView, and MarketScreener.
What are the Largest Companies in the World?
The world has 60+ stock exchanges, and each one has a top company. We looked at the largest local company, since many of the world’s largest firms trade on multiple exchanges, and converted market cap to USD.
|Country||Company||Industry||Market Cap (August 2021)|
|Saudi Arabia||Saudi Aramco||Energy||$1.9T|
|Belgium||Anheuser-Busch Inbev||Consumer Staples||$122.7B|
|Indonesia||Bank Cental Asia||Financials||$54.8B|
|Philippines||SM Investments||Consumer Cyclical||$22.9B|
|Kuwait||Kuwait Finance House||Financials||$21.9B|
|Czech Republic||ÄŒEZ Group||Energy||$15.8B|
|Poland||PKO Bank Polski||Financials||$12.6B|
|Bahrain||Ahli United Bank||Financials||$8.6B|
|Egypt||Commercial International Bank||Financials||$5.9B|
Many are former monopolies or massive conglomerates that have grown in the public space, such as South Africa’s Naspers and India’s Reliance Industries.
Others are local subsidiaries of foreign corporations, including Mexico’s Walmex, Chile’s Enel and Turkey’s QNB Finansbank.
But even more noticeable is the economic discrepancy. Apple and Saudi Aramco are worth trillions of dollars, while the smallest companies we tracked—including Panama’s Copa Group and Oman’s Bank Muscat—are worth less than $5 billion.
Finance and Tech Dominate The Biggest Companies By Market Cap
Across the board, the largest companies were able to accumulate wealth and value.
Some are newer to the top thanks to recent success. Canada’s Shopify has become one of the world’s largest e-commerce providers, and the UK’s AstraZeneca developed one of the world’s COVID-19 vaccines.
But the reality is most companies here are old guards that grew on existing resources, or in the case of banks, accumulated wealth.
|Industry||Biggest Companies by Country|
Banks were the most commonly found at the top of each country’s stock market. Closely behind were oil and gas giants, mining companies, and former state-owned corporations that drove most of a country’s wealth generation.
But as more economies develop and catch up to Western economies (where tech is dominant), newer innovative companies will likely put up a fight for each country’s top company crown.
The World’s 25 Largest Lakes, Side by Side
This unique map graphic uses the Great Lakes region as a point of comparison for the top 25 largest lakes in the world.
The World’s 25 Largest Lakes, Side by Side
In many parts of the world, you don’t have to look very far to find a lake.
According to satellite data, there are roughly 100 million lakes larger than one hectare (2.47 acres) to be found globally. The largest lakes, which rival the size of entire nations, are more of a rarity.
One might expect the world’s largest lakes to be very alike, but from depth to saline content, their properties can be quite different. As well, the ranking of the world’s largest lakes is far from static, as human activity can turn a massive body of water into a desert within a single generation.
Today’s graphic – created using the fantastic online tool, Slap It On A Map! – uses the Great Lakes region as a point of comparison for the largest 25 lakes, by area. This is particularly useful in comparing the scale of lakes that are located in disparate parts of the globe.
The Greatest Lakes
The largest lake in the world by a long shot is the Caspian Sea – a name that hints at a past when it was contiguous with the ocean around 11 million years ago. This massive saline lake, which is nearly the same size as Japan, borders five countries: Kazakhstan, Russia, Turkmenistan, Azerbaijan, and Iran. An estimated 48 billion barrels of oil lay beneath the surface of the basin.
The five Great Lakes, which run along the Canada–U.S. border, form one of the largest collections of fresh water on Earth. This interconnected series of lakes represents around 20% of the world’s fresh water and the region supports over 100 million people, roughly equal to one-third of the Canada–U.S. population.
Amazingly, a single lake holds as much fresh water as all the Great Lakes combined – Lake Baikal. This rift lake in Siberia has a maximum depth of 5,371ft (1,637m). For comparison, the largest of the Great Lakes (Lake Superior) is only 25% as deep, with a maximum depth of 1,333ft (406m). Lake Baikal is unique in a number of other ways too. It is the world’s oldest, coldest lake, and around 80% of its animal species are endemic (not found anywhere else).
Here’s a full run-down of the top 25 lakes by area:
|Rank||Lake Name||Surface Area||Type||Countries on shoreline|
|1||Caspian Sea||143,000 sq mi|
|2||Superior||31,700 sq mi|
|3||Victoria||26,590 sq mi|
|4||Huron||23,000 sq mi|
|5||Michigan||22,000 sq mi|
|6||Tanganyika||12,600 sq mi|
|7||Baikal||12,200 sq mi|
|8||Great Bear Lake||12,000 sq mi|
|9||Malawi||11,400 sq mi|
|10||Great Slave Lake||10,000 sq mi|
|11||Erie||9,900 sq mi|
|12||Winnipeg||9,465 sq mi|
|13||Ontario||7,320 sq mi|
|14||Ladoga||7,000 sq mi|
|15||Balkhash||6,300 sq mi|
|16||Vostok||4,800 sq mi|
|17||Onega||3,700 sq mi|
|18||Titicaca||3,232 sq mi|
|19||Nicaragua||3,191 sq mi|
|20||Athabasca||3,030 sq mi|
|21||Taymyr||2,700 sq mi|
|22||Turkana||2,473 sq mi|
|23||Reindeer Lake||2,440 sq mi|
|24||Issyk-Kul||2,400 sq mi|
|25||Urmia||2,317 sq mi|
The Great Lakes World Tour
For people living in Canada and the U.S., the shape and relative size of the Great Lakes system may be quite familiar. This makes the Great Lakes a fantastic point of comparison to help put the size of other world locations into perspective. To this end, we begin our Great Lakes World Tour.
First, the image below shows how the Great Lakes system would look if it was located in India.
Distortions on commonly used maps can downplay the size of India compared to more northern nations. This view of the Great Lakes can help put India’s true size into perspective.
Next, we look at the Great Lakes overlaid within Central Europe.
In the context of Europe, the lakes are so large that they extend from the Netherlands over to Slovakia. Lake Superior’s surface area of 31,700 mi2 (82,000 km2), is similar in size to Austria. Here’s are the five Great Lakes and European countries of equivalent size:
|Great Lakes||Surface Area||Equivalent Country||Area|
|Lake Superior||82,000 km2 (31,700 sq mi)||🇦🇹 Austria||83,879 km2 (32,386 sq mi)|
|Lake Huron||60,000 km2 (23,000 sq mi)||🇱🇻 Latvia||64,589 km2 (24,938 sq mi)|
|Lake Michigan||58,000 km2 (22,300 sq mi)||🇭🇷 Croatia||56,594 km2 (21,851 sq mi)|
|Lake Erie||25,700 km2 (9,910 sq mi)||🇲🇰 North Macedonia||25,713 km2 (9,928 sq mi)|
|Lake Ontario||19,000 km2 (7,340 sq mi)||🇸🇮 Slovenia||20,271 km2 (7,827 sq mi)|
Lastly, here is a look at the Great Lakes in Southern Australia. Australia is the world’s 6th largest country, so the Great Lakes only occupy one corner of its land mass.
Australia’s lack of glacial history means that there are few permanent freshwater lakes in the country. Many of the country’s largest lakes only fill up during periods of excessive rainfall.
Shrinking out of the rankings
Not far from the world’s largest lake, straddling the border between Kazakhstan and Uzbekistan, lay the sand dunes of the Aralkum Desert. In the not so distant past, this harsh environment was actually the bed of one of the largest lakes in the world – the Aral Sea.
For reasons both climatic and anthropogenic, the Aral Sea began receding in the 1960s. This dramatic change in surface area took the Aral Sea from the fourth largest lake on Earth to not even ranking in the top 50. Researchers note that the size of the lake has fluctuated a lot over history, but through the lens of modern history these recent changes happened rapidly, leaving local economies devastated and former shoreside towns landlocked.
Lake Chad, in Saharan Africa, and Lake Urmia, in Iran, both face similar challenges, shrinking dramatically in recent decades.
How we work to reverse damage and avoid ecosystem collapse in vulnerable lakes will have a big influence on how the top 25 list may look in future years.
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