An echo is an example of sound waves
The answer is: C- reflected.
An echo is a clear example of sound waves and how they are reflected when they pass over a solid surface. This phenomenon is considered very important in the study of sound and its waves. In addition, echo is one of the things that makes us enjoy listening to music and sounds more exciting and beautiful. Therefore, everyone wants to enjoy the echo, listen to it and think about the excitement and happiness it can cause. This confirms the importance of sound waves and their enjoyable and exciting effect on humans and the environment in which they live.
