Rock collecting has never been quite like this! When the class forgets to do its homework, a fieldtrip through the Earth's crust, into the center of the Earth, and out through a volcano will teach them not to forget their assignments again.

Rock collecting has never been quite like this! When the class forgets to do its homework, a fieldtrip through the Earth's crust, into the center of the Earth, and out through a volcano will teach them not to forget their assignments again.

Part of the best-selling science series ever Filled with interesting illustrations and dialog on information every kid should know about what the earth is made of. Follow the Magic Bus and these favorite characters to a journey inside the earth.