Only just seen your question, so you probably aren't in need, but I would recommend How The Earth Works by Christiane Dorion - a beautiful book and full of content. DS's (a geology obsessive) favourite book. Hope that helps! I would also recommend Rockwatch, the nationwide club for young geologists. Find us online: FB: https://www.facebook.com/rockatrockwatch Twitter: @rockwatchclub Web: www.rockwatch.org.uk/
You could try the "Eyewitness Guide" series - I know there's a "rock and minerals" one - there are loads of them in the set and they are really lovely books. We had quite a few when I homeschooled one of the DCs.
Does anyone know of a good book about geology, plate tectonics, glaciers etc that I could get for DS1? (He will be 4 next month)
We were on holiday recently and went to a spot where a lovely U-shaped valley had been created, and there was a brilliant board with lovely drawings and descriptions of how it had happened. It really captured his imagination, and he has kept asking DH and I to tell him about it over and over.
I really want to get him a lovely book about it, but I can't find anything.