"From metamorphic rock to magma and igneous rock to sedimentary rock and back again, the rock cycle is a story millions of years in the making! Rock is constantly forming, wearing down, and forming again. With news about the environment in the forefront, an understanding of how the natural world works is more important than ever, and this book is an ideal companion to any earth science curriculum. This journey to the center of Earth and back will make the rock cycle clear for young readers"-- Provided by publisher.