What is the difference between solids and liquids? How are shadows casted? Introduce early learners to physical science topics with this 18-book set focused on content and literacy development. With easy-to-read text, colorful images and photographs, hands-lab activities, and more, young students will be intrigued as they learn important physical science concepts. Titles include: I Spy, Tell Me About It, Solid or Liquid?, Nature Made, Here Comes the Sun, How Sound Moves, Message Received!, Light Makes a Rainbow, Shadows, How Heat Moves, The Nature of Matter, Forces, Energy, Friction, and Motion.