Sound waves are compression waves, as seen here. the areas of low pressure within a sound wave, area a for example, are called a) amplitudes. b) frequencies. c) rarefactions. d) troughs.

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system

How can you measure the amplitude of a longitudinal wave?