Flip a switch, and we instantly have light. It travels faster than anything we know of and always comes from a source. Find out how light travels and why the sun is our most important light source.
Push an object, and it will move. Push it harder, and it will move farther and quicker. What happens when objects collide with each other? Simple text and bright images will help young readers...
Sound is energy. It travels in waves and enters our ears. But where does sound come from? Students may be surprised by the answer. They may also be surprised how sound can travel through air, water,...
Mountains, valleys, hills, and plains are all part of Earth's solid surface. We call them landforms. In this book, readers will learn about many landforms and the Earth's processes that formed them.
Matter is all around us. Sometimes, we cannot even see it! This book explains how matter comes in different forms and how various conditions, such as heat or cold, can change the form of matter.
