other by a few centimeters each year as the Atlantic widens,
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, and why the Pacific Ocean is shrinking,
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, its seafloor sucked down by subduction along the Ring of Fire — looping from New Zealand to Japan, Alaska and Chile.
By running the process backward in time,
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, geologists can begin to see how oceans and continents have jockeyed for position over millions of years. Computers calculate how plate positions shifted over time, based on the movements of today’s plates as well as geologic data that hint at their past locations.
Those geologic clues — such as magnetic minerals in ancient rocks — are few and far between. But enough remain for researchers to start to cobble together the story of which crustal piece went where,
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“To solve a jigsaw puzzle, you don’t necessarily need 100 percent of the pieces before you can look at it and say it’s the Mona Lisa,” says Brendan Murphy,
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, a geophysicist at St. Francis Xavier University in Antigonish, Nova Scotia. “But you need some key pieces.” He adds: “With the eyes and nose,
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No place like Nuna
For ancient Nuna,
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, scientists are starting to find the first of those key pieces. They may not reveal the Mona Lisa’s enigmatic smile, but they are at least starting to fill in a portrait of a long-vanished supercontinent.
Nuna came together starting around 2 billion years ago, with its heart a mash-up of Baltica (the landmass that today contains Scandinavia),
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, Laurentia (which is now much of North America) and Siberia. Geologists argue over many things involving this first

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