| A | B |
|---|
| ultraviolet rays | pass through skin into tissues |
| UVA | pass through glass and penetrate deep into skin |
| UVB | mostly absorbed by the ozone layer |
| UVC | most damaging but absorbec almost totally by the ozone layer |
| ozone layer | protective layer of oxygen like molecules |
| microwaves | can be absorbed by the water in the cells in our body |
| infrared rays | felt as heat and can cause burns |
| x-rays | high doses can kill normal cells |
| gamma rays | like x-rays and very penetrating |
