By David A. Cooper:-Like with history, geography is best learned primarily by watching television documentaries, though it is also important that you should own an atlas from an early age and have easy access to a globe so that you can look places up quickly and relate what you're seeing on the screen to the right locations. You should also have a 1:50,000 scale map of the area in which you live. A proper course will appear here in the future, but because it is optional learning it is not a high priority. In the mean time, here are a few links to some eye-opening sites:-
Breathing Earth. Put the cursor over a country and study at the numbers at the bottom of the page. (You might want to turn the sound off - it's very irritating.)
Thickness of Earth's crust. Only six miles thick under most of the oceans, and then you're down into the semi-liquid rock.