# The earth has an overall density of 5.5 g/cm^3 similar to other "rocky" worlds in the inner solar system. Saturn has a density of 0.7 g/cm^3. If there was an ocean of water somewhere big enough to hold Saturn, what would happen?

Less dense substances float on more dense substances. An ocean contains sea water, which contains dissolved salts and other solutes. The average density of sea water is $\text{1.027 g/cm"^3}$, so the less dense Saturn would float on the sea water.
Saturn would also float on fresh water, which has a density of $\text{1.0 g/cm"^3}$.