4.1. Our hearing.

There are two parts:

• We can see the outer parts. These are our two ears.

• The inner ears are inside our head. They are very delicate.

• As we know, sound vibrates. The vibrations go into our outer ears. They go along the ear canal.

• The vibrations reach the ear drum. It vibrates.

• The movement of the eardrum reaches the small bones. Then it goes to the cochlea.

• The cochlea collects the information. It sends it to the brain.