When people talk about energy, they often discuss where energy comes from, whether that be fossil fuels, the sun, or nuclear energy. They may talk about how we use energy, such as to heat our homes or power cars. This book covers all of this--plus what happens to energy after it's been used. In short, it answers: Where does it go? Full-color illustrations and diagrams break down science concepts for readers while the main content presents physical science ideas that complement classroom learning. All of the science information supports knowledge building, a key component of the science of reading.