sentences:  This corresponds to a mean density about 4 higher than that of water (i.e., about ), about 20% below the modern value, but still significantly larger than the mean density of normal rock, suggesting for the first time that the interior of the Earth might be substantially composed of metal.Hutton estimated this metallic portion to occupy some (or 65%) of the diameter of the Earth (modern value 55%).With a value for the mean density of the Earth, Hutton was able to set some values to Jérôme Lalande's planetary tables, which had previously only been able to express the densities of the major Solar System objects in relative terms.