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hard rock

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia 0.01 sec.
hard rock [′härd ¦räk]
(geology)
Rock which needs drilling and blasting for removal.

hard rock
Rock, which is found during excavation, that can be removed only by pneumatic tools or explosives.


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They therefore made haste to reach the spot, and did so by the time those who came had laid the bier upon the ground, and four of them with sharp pickaxes were digging a grave by the side of a hard rock.
The dusk fell as suddenly as the natives had warned them, the hollows of the mountain on either side filling up with darkness and the path becoming so dim that it was surprising to hear the donkeys' hooves still striking on hard rock.
 
 
 
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