| TROPOSPHERE | Region of earth's atmosphere |
| ECOSPHERE | Outermost region of Earth's atmosphere, beginning at around 500 km (300 miles) above the surface (9) |
| IONOSPHERE | Region of Earth's upper atmosphere abundant in charged particles |
| OZONE | Region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation, _ layer (5) |
| NITROGEN | Constituent of four fifths of earth's atmosphere |
| TROPICS | Region of earth surrounding the equator (7) |
| DEEPSEA | Largely unexplored region of Earth |
| ARCTIC | ___ Circle (northerly region of Earth) |
| OZONELAYER | Part of Earth's atmosphere (5,5) |
| ARGON | About 1% of earth's atmosphere |
| ICECAP | Frozen region of earth, in a way ? (3-3) |
| FAREAST | Geographical region of Earth including China, Hong Kong, Japan and Korea (3,4) |
| OXYGEN | Gas making up over 20% of Earth's atmosphere (6) |
| GLOBALWARMING | Long-term increase in the average temperature of Earth's atmosphere (6,7) |
| DRYLAND | General description of an area/region of Earth not occupied by water (3,4) |
| EXOSPHERE | One of the five layers of the Earth's atmosphere (9) |
| SPACE | Expanse beyond Earth's atmosphere; or, each one of the gaps between the lines of a stave (5) |
| METEOR | Small body of rock or metal that produces a streak of light when it enters Earth's atmosphere (6) |
| DEW | What is the condensation of water due to the cooling of the Earth's atmosphere at night? (3) |
| OUTERSPACE | Region beyond the Earth's atmosphere |
