| Answer | Crossword Clue |
|---|---|
| GAIA | The earth, when viewed as a self-regulating organism |
| GAIA | ... hypothesis (theory of the earth as a self-regulating organism) |
| GAIA | ... hypothesis (model of the earth as a self-regulating organism) |
| quadrature | The position of the moon or a planet when it is 90░ from the sun as viewed from the earth |
| mare | (Sea of Sirens) an area in the southern hemisphere of Mars, appearing as a dark region when viewed telescopically from the earth |
