How did Earth form? Where did all the water come from? How did Earth’s plates begin to shift? When it comes to our planet, there are a whole lot of questions we’re still trying to answer. Get ready to explore the unknown and discover how scientists are working to solve the mysteries of Earth. With a focus on the scientific method and enquiry, this book uses engaging text and eye-catching photos to show readers how scientists continue to push the boundaries of our knowledge and explain why some questions may never be answered. Part of the Unsolved Science series.