Regional Geology Lab 1-Isostasy and oceanic crust depth 1.Calculate the thickness of the lithosphere in a total depth of 3000 m below sea level by using equilibration of pressures in points 1 and 2 (as we do in isostasy). The middle ocean ridge is at depth of 1500 m. The hot oceanic lithosphere density (dmhot) is 2% less than the cold oceanic lithosphere (dm=3300 kg/m³)

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