# What percentage of the earth is made up of water?

Apr 3, 2016

Also, water has a density of about $1 g c {m}^{-} 3$ at room temperature and pressure, while granite is around $2.7 g c {m}^{-} 3$. While not all rock on earth is granite, it is a fairly good example that rock is heavier in the same volume than water is, so water would not make up a vast majority of the Earth's mass.