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Discover the secrets of the fascinating world beneath your feet! In these books you will meet animals that burrow and live underground, as well as humans who venture under the ground in caves, tunnels and underground railways!
Go deeper underground and become an archaeologist! Discover the bones and fossils of dinosaurs, and learn about mines and the valuable raw materials that can be found in our Earth.
There are so many directions that you could take this topic, that you might not have time to fit it all in!