Zosia has just finished reading (and studying) The Usborne Encyclopedia of Planet Earth. Everything that a teenager should know about our Earth - climate, plants and animals, land shapes, rivers and oceans, the planet itself, earthquakes and volcanoes - can be found in this book. In addition to that Usborne Quicklinks's website has many links to different interesting and fun websites explaining even more in depth these issues.
As a last exercise from this book, Zosia has created a mindmap about different map projections. Here it is: