The earth is not a uniform sphere but has regions of varying density. consider a simple model of the earth divided into three regions—inner core, outer core, and mantle. each region is taken to have a unique constant density (the average density of that region in the real earth):
a. use this model to predict the average density of the entire earth.
b. the measured radius of the earth is 6371km and its mass is 5.974*1024kg use this data to determine the actual average density of the earth.
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