The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system When Jack and Annie got back from their adventure in Magic Tree House #28: High Tide in Hawaii, they had lots of questions. What causes tsunamis? Who studies earthquakes? How do volcanoes form? What should people do if an avalanche hits? Find out the answers to these questions and more as Jack and Annie track the facts. Filled...