| Answer | Crossword Clue |
|---|---|
| MUD | Puddle-bottom earth |
| corers | device having a hollow cylindrical drill or tube, used for taking samples of earth, rock, etc., from below the surface of the ground or ocean bottom |
| corer | device having a hollow cylindrical drill or tube, used for taking samples of earth, rock, etc., from below the surface of the ground or ocean bottom |
| dredger | any of various powerful machines for dredging up or removing earth, as from the bottom of a river, by means of a scoop, a series of buckets, a suction pipe, or the like |
