·Passive margins through earth history |
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PassivemarginsareamongthemostcommonoftheEarth'srst-
ordertectonicfeatures.Thepresent-daypassivemarginshaveanaggregatelengthof105,000km,evenlongerthanthespreadingridges(65,000km)ortheconvergentplateboundaries(53,000km).
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