Everything that takes up space is made out of matter, whether it’s a person, air, or a mountain. This volume covers the fundamental concepts students need to understand matter. Fact boxes highlight and further explain vocabulary words, while Compare and Contrast and Think About It boxes encourage readers to think and explore the ideas further. The lively narrative uses true-to-life examples to explain concepts, while bright color photographs and illustrations reinforce facts and examples. This informative book supports Common Core Science Standards, evaluation of evidence, understanding scientific theories, and connecting and relating knowledge. Readers will understand why matter really matters!