that's a very odd graphic, no point in trying to illustrate something in this way,
the highest elevation on earth is a tad over 5 miles ( Everest peak )
not much more when looking elsewhere to take in to account the anomalies in the earths sphere.
yes it's an interesting thought that water is a very thin skin around most of the planet,
as is our atmosphere , Ive been looking into gravity lately (I remember asking adults about this when I was 6 years old lol without getting any sensible answers ! )
the earth/universe is a facinating subject but can keep one up late at nights lol