Brief text and photographs describe how sound waves bring us information about our world and explain how the amount of energy in a sound wave is measured at its height or amplitude.
Photographs and text help readers decipher the differences between dolphins and porpoises, describing the physical features, behaviors, habitats, and other unique attributes of each species.
Photographs and text help readers decipher the differences between alligators and crocodiles, describing the physical features, behaviors, habitats, and other unique attributes of each species.
"Journey to the rain forest by inspecting the biome's key characteristics, animals, and plants. Readers will explore how they all work together to support life in a rain forest"--Provided by publisher.
An exploration of simple machines that discusses inclined planes, wedges, screws, levers, pulleys, and wheels and axles, and includes instructions for related experiments and activities.