What makes the ground shake? In this simple nonfiction eBook, children explore what earthquakes are, why they happen, and how they affect the world around us. With easy comparisons, playful questions, and sound effects, young readers learn how vibrations travel through the Earth, why buildings can shake, and how earthquakes can even cause tsunamis. The book also introduces how scientists measure earthquakes and explains that most last less than a minute. This engaging introduction helps kids understand a powerful force of nature in a way that feels exciting and approachable.