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Atmosphere
| Term | Definition |
|---|---|
| Atmosphere | the envelope of gases surrounding the earth or another planet. |
| troposphere | the lowest region of the atmosphere |
| stratosphere | second major layer |
| mesosphere | is the middle layer |
| ionosphere | the layer of the earth's atmosphere that contains a high concentration of ions and free electrons and is able to reflect radio waves. |
| thermosphere | is very hot |
| exosphere | outermost region of the plant |
| ultra Violette radiation |