Lesson Summary:
The lesson gives the children a basic knowledge of the way our ears work and warns them of the dangers of noise pollution. Activity A reinforces the information given in the reading. This activity should be done without access to the original diagram but the diagram may be given to the children afterwards for self correction. Activity B is designed to increase their awareness of noise pollution in their environment.
Objectives:
- The children will be able to identify the parts of the ear and explain how we hear.
- The children will be able to discuss and give examples of noise pollution.
Subject Area:
Science
Lesson Excerpt:
Sound waves move through the air and are picked up by the pinna or outer ear – that’s the part that you can see. They move into the ear and hit the ear drum, making it vibrate. The three little bones in the ear, the hammer (malleus), the anvil (incus) and the stirrup (stapes) pick up the vibrations and pass them on to the cochlea which is a snail shaped organ filled with fluid. From the cochlea the vibrations are passed on to the auditory nerve which turns them into an electrical impulse or signal and sends them to the brain. The brain receives the signal and interprets what we have heard.
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