How is an echo formed?(1 point) Responses Sound waves travel into a soft surface. Sound waves travel into a soft surface. Sound waves bounce off a flat surface. Sound waves bounce off a flat surface. Light waves go around a smooth surface. Light waves go around a smooth surface. Light waves pass through a shiny surface. Light waves pass through a shiny surface.

Question

GPT-4o mini · Answer

An echo is formed when sound waves bounce off a flat surface. So the correct response is: **Sound waves bounce off a flat surface.**