| Answer | Crossword Clue |
|---|---|
| MARS | Earth's outer neighbor |
| CRUST | Earth's outer layer |
| PLATE | Part of the earth's outer layer |
| FELDSPAR | 60% of the earth's outer crust |
| geocorona | an outer layer of the earth's atmosphere |
| geocoronae | GEOCORONA, an outer layer of the earth's atmosphere |
| geocoronas | GEOCORONA, an outer layer of the earth's atmosphere |
| ionopause | the region of the earth's atmosphere at the outer limit of the ionosphere |
| ionopauses | IONOPAUSE, the region of the earth's atmosphere at the outer limit of the ionosphere |
