http://www.popsci.com/technology/article/2011-03/esa-generates-most-sophisticated-geoid-yet-goces-gravity-data
Apparently, the earth's gravity is still not completely uniform even after having billions of years to settle. This map shows the varying levels of gravity around the globe. Unfortunately, this article doesn't explain some of the prominent irregularities in the picture. For instance, why is there a huge surge of gravity in Canada? And why does the level of gravitational pull appear to be severely different from plate to plate?
Hmmm, why indeed?
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