Gratuit avec l'essai de 30 jours
-
Sound Waves
- Narrateur(s): uncredited
- Durée: 4 min
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Sound Waves
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Description
Birds chirp. A dog barks. Thunder claps. We hear sounds all around us. But how? Sound waves travel through the air, but we don't see them. Listeners will learn about sound waves and how we use them every day.
Ce que les critiques en disent
"These titles feature objects and processes that will be familiar to students, such as video games, cell phones, and GPS. The connection of each type of wave to kids’ everyday lives makes the content relevant to young readers. Photos and diagrams depict bats using echolocation, the formation of rainbows, weather radar, and other examples of waves in action. Each book ends with directions for an activity to explore the concepts covered. Students might experiment with trying to block the signal to a radio-controlled car or making music with glasses of water. The series could be read to first graders or explored independently by older students. VERDICT A solid introduction to the concepts; a good addition to collections". (Suzanne Costner, Fairview Elementary, Maryville, TN)