LiveScience.com - A mysterious dip in gravity over Canada has been a weighty topic for some scientists. Now satellite data reveal a thick ice sheet that once cloaked the region partially resolves this so-called gravitational anomaly. Scientists have known that the Hudson Bay region features lower gravity than surrounding areas. While two theories have emerged to explain the strange phenomenon, conclusive evidence has been elusive. One theory involved a change in the area's overlying glacial weight as the Laurentide Ice Sheet melted. ...
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