other by a few centimeters each year as the Atlantic widens, 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,
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, 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,
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, 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,
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. But enough remain for researchers to start to cobble together the story of which crustal piece went where.
“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,
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,” 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, you have a chance.”
No place like Nuna
For ancient Nuna, scientists are starting to find the first of those key pieces. They may not reveal the Mona Lisa’s enigmatic smile,
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, 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), Laurentia (which is now much of North America) and Siberia. Geologists argue over many things involving this first

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