What is the highest mountain in the world? What is the Earth's core made of? Find out in this quiz book, packed with questions and facts about Planet Earth. Challenge yourself, your family, and friends with awesome questions based on the award-winning online Kahoot! games. Answer the questions, keep score, and declare the winner. Scan the QR codes throughout the book to find more cool quizzes on the same topics within Kahoot! and test your knowledge further.