Down
| 2. | This is the coldest part of the atmosphere. Some large helium balloons can reach this height in the atmosphere. |
| 4. | The trapping of heat rays from the sun by carbon dioxide, water vapor, and other gases. (2 words) |
| 5. | Ozone's absorption of ultraviolet light warms the air in this layer of the atmosphere to about forty degrees Fahrenheit. |
| 6. | The rise in the earth's temperature that may be a result of the increase of chlorofluorocarbons (CFCs) in the air. (2 words) |
| 7. | The only layer of the atmosphere able to support life. |
| 10. | The mixture of gasses that surround the earth. |
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Across
| 1. | This reaches from the ground to about 700 km above the Earth. |
| 3. | Approximately 21% of the troposphere is this gas. |
| 8. | 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. | Approximately 78% of the troposphere is this gas. |
| 11. | The changing conditions of the atmosphere in one place at a certain time, including temperature, humidity, wind, clouds, and air pressure. |
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