| Answer | Crossword Clue |
|---|---|
| aethers | AETHER, the upper region of the atmosphere |
| aether | the upper region of the atmosphere |
| troposphere | a region of the atmosphere from 25,000 feet to 55,000 feet, the boundary between the upper troposphere and the lower stratosphere |
| tropospheres | TROPOSPHERE, a region of the atmosphere from 25,000 feet to 55,000 feet, the boundary between the upper troposphere and the lower stratosphere |
| ionosphere | a region of the upper atmosphere |
| ionospheres | IONOSPHERE, a region of the upper atmosphere |
