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| ionosphere |
layers of the earth's atmosphere located above the stratosphere from about thirty to two hundred and fifty miles above the earth's surface, and composed of rarefied gases that have been ionized by radiation from the sun. |
| mesosphere |
the earth's atmosphere between the stratosphere and the thermosphere, or from twenty miles to fifty miles above the earth's surface. |
| ozone depletion |
a steady decline in ozone in Earth's stratosphere, or a springtime decline in stratospheric ozone in Earth's polar regions. The primary cause of ozone depletion is man-made chemicals, particularly chlorofluorocarbons (CFCs). |
| stratopause |
the zone between the mesosphere and stratosphere wherein temperatures drop as altitude increases, about thirty-one to thirty-five miles above the earth. |
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