Mesh Modeling Exercise 01

sketchfab

My models seem fine but I'm not sure if they have the correct dimensions - it looks like they're displaying my knowledge of techniques, although the sizes appear to be off still.\nOne thing that's been puzzling me is removing the internal faces of the bottom ring from the extruded globe model; the third model to the left was giving me trouble. I tried a variety of deletion and dissolving methods but couldn't get it to work. It would be helpful to know how this can be done, as it seems like an essential skill to master.