Planet Earth - Children's Reference Full of spectacular photos and extraordinary facts, PLANET EARTH offers a fascinating tour of our planet. Learn all about how the Earth was formed, what its interior is like and the mysterious landscapes that lie deep beneath the ocean. Why do we have seasons? Where does weather come from? What causes the terrifying natural disasters--earthquake... more »s, tsunamis, and tornadoes--that rage across our planet's surface? PLANET EARTH answers all of these questions and many more!« less