Q3_W5_G5

It is produced by the vibrations in the air.

It's a repeated sound reflected from a hard surface.

When a sound wave hits a hard surface and it cannot pass through, the sound bounces back.

It's reflected from the hard surface  of a smaller space, the sound may bounce off walls several times, producing multiple echoes. 

It helps animals find their way and search for food. 

Do dolphins used echolocation? Yes or no.

Sound wave changes speed as it travels through the air at different temperatures.

Does pillow Absorb or Transmit?

Does rug Absorb or Transmit?

Does a wall Absorb or Transmit?