The Project Gutenberg eBook of Physical Geography,  · The same process is now in progress in the high southern latitudes, where icebergs have been met with covered with fragments of rock and boulders. [10] The last manifestation of creative power, with few exceptions, differs specifically from all that preceded it; the recent strata contain only the exuviæ of animals now living, often mixed with the works of man.Difference Between Density and Specific Gravity,  · Both density and specific gravity describe mass and may be used to compare different substances. They are not, however, identical measures. Specific gravity is an expression of density in relation to the density of a standard or reference (usually water). Also ...