| A | B |
|---|
| antarctica | the Earth's protective layer is thinnest above this continent |
| 50 | The ozone layer will heal itself in this number of years |
| filters | the ozone layer protects Earth because it ____ ultraviolet radiation from the sun |
| aerosol | this type of can once used CFCs, but is now safe for the ozone layer |
| atmosphere | a very thin layer wrapped around the Earth |
| depletion | the process by which the ozone becomes thinner |
| troposphere | the layer of the atmosphere in which weather occurs |
| twenty six | aerosol cans have been CFC free for this number of years |
| oxygen | an ozone molecule is made up of three atoms of this |
| blue | the color of ozone |
| cfcs | the manmade chemicals harm the Earth's protective ozone layer |
| montreal protocol | this international treaty was adopted in 1987 to eliminate CFC production worldwide |
| skin cancer | too much ultraviolet radiation can cause this disease in humans |
| chlorine | this element in CFCs depletes the ozone layer |
| stratosphere | the layer of the atmosphere where Earth's protective ozone layer is located |
