Down
| 1. | The trapping of heat rays from the sun by carbon dioxide, water vapor, and other gases. (2 words) |
| 2. | The only layer of the atmosphere able to support life. |
| 4. | Approximately 21% of the troposphere is this gas. |
| 5. | The rise in the earth's temperature that may be a result of the increase of chlorofluorocarbons (CFCs) in the air. (2 words) |
| 6. | The moon does not have an ____, therefore the moon has no greenhouse effect. |
| 7. | The layer of the atmosphere that is between the thermosphere and stratosphere. |
| 8. | The layer of the atmosphere where planes fly. The thin air is not suitable for humans, but planes run most efficiently in this layer of the atmosphere. |
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Across
| 3. | Air density in this layer of the atmosphere is extremely low. This layer of the atmosphere has the greatest variation in temperature from a low of negative ninety-three degrees Celsius to a high of fifteen hundred degrees Celsius. |
| 9. | The mixture of gasses that surround the earth. |
| 10. | The changing conditions of the atmosphere in one place at a certain time, including temperature, humidity, wind, clouds, and air pressure. |
| 11. | Approximately 78% of the troposphere is this gas. |
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