| A | B |
|---|
| vibrate | to move back and forth quickly |
| sound | form of energy that comes from objects that vibrate |
| volume | describes how loud a sound is |
| pitch | how high or low a sound is |
| absorb | to take in |
| reflect | to bounce off a surface |
| refract | to bend |
| translucent | scattering light that passes through, so that objects appear blurry |
| transparent | letting all light through |
| opaque | not allowing light to pass through |
| eardrum | a thin membrane that vibrates when sound waves reach it |
| cochlea | a spiral-shaped, fluid-filled inner ear structure; it is lined with cilia (tiny hairs) that move when vibrated |
| eyelid | the flap of skin that can cover and protect the ey |
| optic nerve | the nerve that transmits electrical impulses from the retina to the brain |
| retina | light-sensitive tissue that lines the back of the eye |
| lens | helps to focus light on the retina-located behind the iris, it is clear and colorless |
| cornea | the clear, dome-shaped tissue covering the front of the eye |
| iris | the colored part of the eye that regulates the amount of light permitted to enter the eye. (remember, the more light, the smaller the opening) |
