| Answer | Crossword Clue |
|---|---|
| rilles | RILLE, a valley on the moon's surface |
| rille | a valley on the moon's surface |
| RILLE | Trench on the moon's surface. |
| RILLE | Cleft on the moon's surface. |
| RILLE | Valley on the surface of the moon. |
| glaciers | a large body of ice moving slowly down a slope or valley or spreading outward on a land surface |
