G. W. Moore 1972 <div id="Abs1-section" class="c-article-section"><div id="Abs1-content" class="c-article-section__content"><p>A SEEMING paradox has puzzled investigators of the crustal structure of the Gulf of Mexico since Ewing<span>&nbsp;</span><i>et al.</i>¹<span>&nbsp;</span>calculated that a unit area of the rather thick crust in the gulf contains less mass than does a combination of the crust and enough of the upper mantle to make a comparable thickness in the Atlantic Ocean. They also noted that the free-air gravity of the gulf is essentially normal and fails by a large factor to be low enough to reflect the mass difference that they calculated. We propose a solution to this problem.</p></div></div> application/pdf 10.1038/238452b0 en Nature Crust and mantle of the Gulf of Mexico article