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Evidence of the ocean-floor spreading was given from marine magnetic surveys and later independently verified from the age dating of ocean-floor rock samples and from seismic studies.The process of oceanic lithosphere cooling directly controls the lateral density distribution across ocean-floor profiles.The increasing lithospheric density with age should be detectable in marine gravity data.This is demonstrated using refined gravity data, which are corrected for gravitational signals of the anomalous crustal density structures and the Moho geometry.The additional correction term for the iithospheric thermal cooling reveals inhomogeneous lithosphere structures such as hot spots and subducted oceanic slabs.