When a big earthquake hits, it seems impossible that scientists could measure it. But they can, even if they're far away from the epicenter. The devastating and fascinating details of how earthquakes and volcanoes happen will engage readers from the moment they open this book. Including introductions to key geologic terms such as tectonic plates and seismic waves, the main content explains these key Earth science topics using clear language and diagrams. The explosive information is further highlighted by full-color photographs in an exciting design sure to engage readers from beginning to end.