Sound Waves Vocabulary and Cloze Practice

Fill in the blanks. 1. A rapid back-and-forth movement is called a(n) vibration.2. Anything that has mass and takes up space is matter.3. A percussion instrument makes sound with a vibrating surface.4. The part of a sound wave where the molecules are crowded together is called compression.5. Sound waves are collected in the human ear.6. A vibration that spreads away from vibrating object is a(n) sound wave.7. The part of a sound wave where the molecules are spread apart is called rarefaction. Fill in the blanks. Sound is a vibration that ravels through matter. Some types of matter are made of pieces too small to be seen, called molecules. Molecules are the smallest pieces that matter can be broken into without changing the kind of matter. When a string vibrates, it makes molecules of gases in the air next to it vibrate. A vibration that spreads away from a vibrating object is a sound wave. It carries the energy from the vibrating object outward in all directions. When sound waves reach your ear, they make the parts inside vibrate. Since air is a mixture of gases, you may conclude that sound can travel through gases.