| Answer | Crossword Clue |
|---|---|
| subsurface | The stratum or strata below the earth's surface |
| subsurfaces | The stratum or strata below the earth's surface |
| sonde | any of various devices for testing physical conditions (as at high altitudes, below the earth's surface, or inside the body) |
| plutonic | noting or pertaining to a class of igneous rocks that have solidified far below the earth's surface |
| NETHER | Below the earth's surface. |
| sinking | force down especially below the earth's surface |
| plutons | any body of igneous rock that solidified far below the earth's surface |
| pluton | any body of igneous rock that solidified far below the earth's surface |
