Extreme Planet: Journey to the Earth's coreFrom crust to core, dig down and uncover the amazing things deep inside the Earth. Extreme Planet: Journey to the Earth's Core takes you on a fascinating journey deep inside the Earth. From the rocky, moving plates that make up the surface, to the core hotter than the Sun, lift the flaps to discover what explodes out of volcanoes, how nearly everything we use each day comes from under the ground, how digging down can take you back in time, and even