What are practical uses that can be made of the fact that sound waves travel through solids?

Answer 1

You can listen to everything that's going on

in the motel room next to yours.

Answer 2

Sound waves traveling through solids can be used for non-destructive testing to detect internal flaws in materials such as metals. They are also employed in medical imaging techniques like ultrasound to visualize tissues inside the body. Additionally, in the field of engineering, sound waves can be utilized for monitoring structural integrity and detecting defects in buildings or infrastructure.