Geologists can learn about rock layers beneath the surface of Earth using sound waves. They use a vibration truck to send sound waves into the ground. A measuring truck has special microphones, called geophones, that pick up sounds. This method for learning about rock layers depends on what characteristic of sound waves?A. Sound waves can travel through and reflect off rock layers. B. Sound waves require energy, such as electricity to generate them. C. Sound waves can travel for an unlimited distance from the source that creates them. D. Sound waves are absorbed by dense solids and reflect off liquids.