The surface shape is overexaggerated. The globe radius is 6000 km, the biggest difference between the mountain and the ocean depth is less than 20 km.
The differences in altitude shouldn't be so great if the drawing is made to scale. Also, the scale itself is strange. A range of -80 to +80 (meters?) the oceans are nearly 4-5km deep and the Everest is almost 9km above sea level. On planetary scale, +/- 10km isn't as pronounced as on this model. For illustrative purposes, I can see why the artist would over exaggerate the differences in elevation though. oh well. nice illustration either way :)
yeah, I've googled the diameter of Eaarth that is equal 12k km. So the scale is really unbelievable
Ah! Since I got curious, I found the source. http://www.asu.cas.cz/~bezdek/vyzkum/rotating_3d_globe/ This is a geoid map of our planet--supposed to help "visualizing the geoid height of new global gravity field models", exaggerated for easy viewing. Interesting stuff!