What Is Sound?
Students begin their investigation of sound by listening to sounds and noting differences in pitch and volume. They experiment to ﬁnd out what makes a loud sound and what makes a soft sound. Students also learn that sounds are made by vibrating objects. They are given the opportunity to feel the vibrations of the tines of a tuning fork and see the vibrations make ripples in water.
Learn by Reading
For additional content-area reading, check out the Houghton Mifflin Science eBook: Grade K, Unit F, pages 59–60.