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Global Statistics

All countries
114,545,709
Confirmed
Updated on February 28, 2021 5:05 pm
All countries
90,028,474
Recovered
Updated on February 28, 2021 5:05 pm
All countries
2,540,120
Deaths
Updated on February 28, 2021 5:05 pm

Continental Drift: A Revolutionary Theory That Was Once Considered Pseudoscience

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Scientific opinion shifts in the identical method continents do — very, very slowly. Generally the change is so lengthy coming that the writer of a brand new idea doesn’t reside to see his work vindicated. Generally he freezes to loss of life, on an expedition in an Arctic wasteland, many years earlier than his friends lastly acknowledge him as a visionary.

Such was the destiny of Alfred Wegener (1880-1930), a German scientist who lived and died with the unwavering conviction that the bottom we stand upon will not be as stable because it appears. He was proper, in fact. Geologists at the moment settle for the fundamentals of his idea of continental drift — albeit within the extra refined context of plate tectonics — as a reality of nature: Our planet’s configuration of land and ocean was totally different hundreds of thousands of years in the past, and will likely be totally different hundreds of thousands of years from now.

The specialists of Wegener’s personal time, nonetheless, dismissed the idea as pseudoscience and recognized him with “shifting crust illness and wandering pole plague.” They did finally be part of him on the appropriate facet of historical past, after a half-century’s value of efforts to discredit his work and disparage his character. However as he waited for the remainder of the world to embrace his concepts, it might nicely have felt like standing on the Florida coast and watching the horizon for the strategy of Africa. 

An Exterior Perspective

The person who toppled the edifice of geological information wasn’t even a geologist. A skilled astronomer, sure; a daring and famend explorer, sure; an authority on Earth sciences, no. Wegener was a meteorologist, higher recognized for holding the world report for the longest hot-air balloon flight somewhat than rock-related analysis.

(Credit score: Public Area/Wikimedia Commons)

Undoubtedly, his lack of credentials put him at odds with institution teachers from the beginning, however their scorn got here additionally from a agency perception that the continents had at all times stood in roughly the identical place. Many individuals had made the obvious remark that the continents match collectively like puzzle items (most clearly alongside the coasts of South America and Africa), however the dogma of continental permanence ran so deep that Wegener was the primary to significantly take into account its logical conclusion: At some distant time, they will need to have been joined.

When he first seen this jigsaw match on a world atlas, across the Christmas of 1910, he too discovered it “unbelievable,” he wrote. However the subsequent fall he discovered that many fossils on both facet of the Atlantic, in West Africa and Brazil, have been practically an identical. He additionally discovered that to account for this, his contemporaries instructed crops and animals had crossed historical land bridges which had since sunk into the oceans. Wegener started to suppose his speculation may not be unbelievable, in spite of everything.


Learn extra: Plate Tectonics: The Slow Dance of Our Planet’s Crust


Over the subsequent few months, as he constructed his case, he had no qualms about ditching the established order. A month earlier than he publicly offered his idea, in December 1912, he wrote to his mentor and future father-in-law, Wladimir Koppen: If the proof favored continental drift, he requested, “why ought to we hesitate to toss the previous views overboard? Why ought to this concept be held again for ten and even thirty years?”

In hindsight, it’s clear these are the phrases of an idealist. Dispassionate objectivity is the said purpose of science, true — however the response to Wegener’s proposal is a stark reminder that flesh-and-blood scientists don’t at all times verify their feelings on the laboratory door.

The Puzzle Comes Collectively

After publishing his first papers on the topic — which have been principally ignored — in 1912, Wegener dropped his geological investigation for some time. He joined an expedition to Greenland, returned and married Else Koppen, had a primary baby, Hilde, and was referred to as to lively responsibility in Belgium in the beginning of World Warfare I. 

Later, as he recovered from battle wounds, he formulated his concepts in a ebook, The Origin of Continents and Oceans, printed in 1915. Its premise was that the Earth’s crust consisted of two layers, with the higher layer drifting always alongside the decrease, just like the icebergs he’d seen floating throughout the Arctic seas. Greater than 250 million years in the past, he wrote, the continents of at the moment fashioned a single, huge landmass which he named Pangaea (Historic Greek for “all-Earth”). Surrounding this supercontinent was a superocean, Panthalassa (“all-sea”).

The proof to help this stunning argument got here — unusually, in that period of strict specialization — from all over the place: geology, geophysics, biology, paleontology, paleoclimatology and past. This oft-denounced multidisciplinary technique was essential to Wegener’s discovery. “It is just by combing the data furnished by all of the Earth sciences,” he wrote, “that we are able to hope to find out ‘reality’ right here.”

Wegener discovered among the strongest help for continental drift — which he really referred to as continental displacement — within the hanging similarity between many rock formations now separated by oceans. “It’s simply as if we have been to refit the torn items of a newspaper by matching their edges after which verify whether or not the strains of print run easily throughout,” he wrote. On the organic facet, he was impressed by the resemblance not solely of marsupials but additionally of the parasites that infect them, in each Australia and South America. 

1200px-Wegener Expedition-1930 008

(Credit score: Public Area/Wikimedia Commons)

He knew he had mustered solely oblique proof, Lisa Yount writes within the biography, Alfred Wegener: Creator of the Continental Drift Concept. Nonetheless, he “believed that the amount and number of his proof have been so nice that they amounted to proof.”

‘Utter, Damned Rot’

The geologists of the world emphatically disagreed. After a few ignored editions and an English translation, Wegener’s ebook sparked an mental firestorm within the Twenties. The Austrian paleoclimatologist Fritz Kerner von Marilaun spoke of Wegener’s “delirious ravings,” whereas the British geologist Philip Lake stated at a gathering of the Royal Geographical Society that Wegener was “not looking for reality; he’s advocating a trigger and is blind to each proven fact that tells in opposition to it.”

The People — who had been at battle with Wegener’s homeland just some years earlier — have been particularly hostile. A good abstract of their response got here from William Berryman Scott, president of the American Philosophical Society, who bluntly declared the idea “utter, damned rot.” 

Throughout a 1926 convention in New York Metropolis to debate continental drift, the main specialists attacked its each line of proof. A lot of their critiques have been legitimate — particularly concerning the unconvincing suggestion that the mechanism for drift is perhaps both centrifugal pressure from the Earth’s rotation or tidal pull on the planet’s crust — however, Yount writes, “they need to not have been sufficient to make Earth scientists discard Wegener’s idea fully.”


Learn extra: The Next Pangea: What Earth’s Future Supercontinent Will Look Like


Nonetheless, they did, and their ridicule scared away most would-be pursuers of continental drift. It’s plain to see what was at stake for these males — the idea undermined the inspiration of a science they’d devoted their lives to. “If we’re to imagine Wegener’s speculation,” wrote Rollin Chamberlin, a distinguished geologist on the College of Chicago, “we should neglect every thing which has been discovered within the final 70 years and begin over again.”

Even within the controversy of these early days, although, the primary traces of acceptance have been seen. “We’re discussing this speculation as a result of we wish him to be proper,” stated George William Lamplugh on the Royal Geographical Society assembly, noting that it will remedy many long-standing issues for geology. “The underlying thought might but bear higher fruit.” 

However that fruit wanted proponents daring sufficient to domesticate it, and people have been scarce. As British geologist Richard Dixon Oldham put it on the time, “it was greater than any man who valued his repute for scientific sanity must enterprise to advocate something like this idea.”

1200px-Wegener Expedition-1930 008

Wegener (left) and Rasmus Villumsen in Greenland, 1930. (Credit score: Public Area/Wikimedia Commons)

Demise and Recognition

Possibly Wegener wasn’t apprehensive about his repute. Possibly he was assured posterity would restore it. Both method, he stored looking out, answering the barrage of criticism and censure with ever extra refined proof. However by 1929, when he printed the fourth and closing version of his ebook, it nonetheless suffered from a deadly flaw: Compelling as his wild mix of proof was, it couldn’t clarify what induced the Earth’s crust to maneuver.

The following yr, Wegener launched into his final journey: a climate analysis expedition on Greenland’s distant, barren ice sheet. He spent the summer time and fall hauling provides by dogsled to the analysis station 250 miles inland, however as winter drew close to, the locals he had employed abandoned him. With a band decreased to solely two males, he made a closing supply of simply sufficient meals and gasoline to maintain the station’s crew alive till spring. On Nov. 1, 1930, he left for the coast. The temperature had dropped under -60 levels Fahrenheit.

Alongside the best way he died, in all probability from a coronary heart assault. Months later, when a search celebration discovered his physique, one member reported his face appeared “relaxed, peaceable, virtually smiling.” Wegener was honored as an ideal meteorologist and Arctic explorer — not because the architect of an ideal geological idea.

On that entrance, it will take three extra many years for the world to catch up. As late as 1958, a ebook rejecting continental drift included a foreword by Albert Einstein. Then, out of the blue, in considered one of science’s nice “I informed you so” moments, the discoveries of seafloor spreading and the fixed rumbling and grinding of colossal tectonic plates lastly introduced continental drift into the mainstream. 

Wegener didn’t get every thing proper. It’s not the continents that drift, per se, however somewhat the slabs of crust, or lithosphere, to which they’re connected. And the pressure driving this drift isn’t centrifugal or tidal, however convective — the Earth’s inside warmth retains these slabs in movement. However this theory of plate tectonics, one of many nice revolutions in trendy science, owes its existence to Wegener’s personal inventive idea and his willingness to think about past the bounds of accepted knowledge. Continental drift, writes British geologist Anthony Hallam, “stands not merely as a forerunner of the idea that now prevails however as its true ancestor.”



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