Why is the Earth called terrestrial? Can we call the Earth an ocean planet? Why is Earth called a terrestrial planet even though it is 70% covered by water?
There really isn't a lot of water on the Earth. The image below, from the USGS science school, graphically illustrates the volume of the water on (and in) the crust of the Earth, relative to the volume of everything else.



The bigger blue ball is all the salt water, from all the oceans &amp; seas, the small one is all the fresh water, from the rivers, lakes and aquifers. You may need to zoom in to see the fresh water ball...

There is more water dissolved in the mantle, but we can't get at it (with current technology), apart from what's released in volcanic eruptions.