Dreams In Life

Hearing is one of our sense. We hear when our ears pick up sound waves in the air which make our eardrums vibrate. These vibration are passed on to nerves inside the ear, which send messages to the brain. Then tells us what the sound are like.

When the sound waves vibrate slowly, we hear a low, or low -pitched, sound.When the sound vibration are fast, we hear high-pitch sounds.Some animals, such as dogs, can hear much higher sounds than we can and we sometimes use 'silent' whistles make is so high that we can't hear it, but the dogs can.

Bats can make and hear even higher sounds. They make these sounds to find their way around at nigh by listening for echoes form things in their path.They find their prey in the same way.