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A Terrible Rift

A billion years ago, the core of what was to become North America nearly ripped apart, creating a huge branched scar that extends from the tip of Lake Superior deep into the Midwest. Washington University in St. Louis scientists are using data from seismometers they placed across and along the rift to take a good hard look.
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(Washington University in St. Louis) A billion years ago, the core of what was to become North America nearly ripped apart, creating a huge branched scar that extends from the tip of Lake Superior deep into the Midwest. Washington U...

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