We all rememÂber learnÂing about tecÂtonÂic plates in our school sciÂence classÂes. Or at least we do if we went to school in the 1960s or latÂer, that being when the theÂoÂry of plate tecÂtonÂics — which holds, broadÂly speakÂing, that the EarthÂ’s surÂface comÂprisÂes slowÂly movÂing slabs of rock — gained wide accepÂtance. But most everyÂone alive today will have been taught about Pangea. An impliÂcaÂtion of Alfred WegenÂer’s theÂoÂry of “conÂtiÂnenÂtal drift,” first proÂposed in the 1910s, that the sinÂgle giganÂtic landÂmass once domÂiÂnatÂed the planÂet.
Despite its renown, howÂevÂer, Pangea makes only a brief appearÂance in the aniÂmaÂtion of EarthÂ’s hisÂtoÂry above. GeoÂlogÂiÂcal sciÂenÂtists now catÂeÂgoÂrize it as just one of sevÂerÂal “superÂconÂtiÂnents” that plate tecÂtonÂics has gathÂered togethÂer and broÂken up over hunÂdreds and hunÂdreds of milÂlenÂnia. OthÂers include KenorÂland, in exisÂtence about 2.6 bilÂlion years ago, and Rodinia, 900 milÂlion years ago; Pangea, the most recent of the bunch, came apart around 175 milÂlion years ago. You can see the process in action in the video, which comÂpressÂes a bilÂlion years of geoÂlogÂiÂcal hisÂtoÂry into a mere 40 secÂonds.
At the speed of 25 milÂlion years per secÂond, and with outÂlines drawn in, the moveÂment of EarthÂ’s tecÂtonÂic plates becomes clearÂly underÂstandÂable — more so, perÂhaps, than you found it back in school. “On a human timescale, things move in cenÂtimeÂters per year, but as we can see from the aniÂmaÂtion, the conÂtiÂnents have been everyÂwhere in time,” as Michael TetÂley, co-author of the paper “ExtendÂing full-plate tecÂtonÂic modÂels into deep time,” put it to Euronews. AntarcÂtiÂca, which “we see as a cold, icy inhosÂpitable place today, actuÂalÂly was once quite a nice holÂiÂday desÂtiÂnaÂtion at the equaÂtor.”
CliÂmate-change trends sugÂgest that we could be vacaÂtionÂing in AntarcÂtiÂca again before long — a trouÂbling develÂopÂment in othÂer ways, of course, not least because it underÂscores the imperÂmaÂnence of EarthÂ’s curÂrent arrangeÂment, the one we know so well. “Our planÂet is unique in the way that it hosts life,” says DietÂmar MĂĽller, anothÂer of the paper’s authors. “But this is only posÂsiÂble because geoÂlogÂiÂcal processÂes, like plate tecÂtonÂics, proÂvide a planÂeÂtary life-supÂport sysÂtem.” Earth won’t always look like it does today, in othÂer words, but it’s thanks to the fact that it doesÂn’t look like it did a bilÂlion years ago that we hapÂpen to be here, able to study it at all.
RelatÂed ConÂtent:
A Map Shows Where Today’s CounÂtries Would Be LocatÂed on Pangea
What Earth Will Look Like 100 MilÂlion Years from Now
Based in Seoul, ColÂin MarÂshall writes and broadÂcasts on cities, lanÂguage, and culÂture. His projects include the SubÂstack newsletÂter Books on Cities, the book The StateÂless City: a Walk through 21st-CenÂtuÂry Los AngeÂles and the video series The City in CinÂeÂma. FolÂlow him on TwitÂter at @colinmarshall or on FaceÂbook.
Where’s the video?