hard rock

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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.
References in periodicals archive ?
Decibel, an underground hard rock and extreme heavy metal music magazine published by Red Flag Media, chose CMS400.
He then asked opposition leader Sir Alber Bore: "Do you listen to heavy metal music, or are you more of a bhangra person?
I began to write the song about an ex-lover who betrayed me who loved heavy metal music.
A celebration of the links between metal manufacturing in the Black Country and Heavy Metal music.
Victims were allegedly played heavy metal music on repeat at high volumes, interspersed with Westlife's cheesy tune.
EPG worked the Northern Invasion heavy metal music festival in Somerset, Wis.
A NEW heavy metal music night is opening in Birmingham and those with a lucky golden ticket can get in free.
Teen tearaway Jacob's obsession with the high-risk world of motocross and his passion for heavy metal music all adds to his reckless behaviour.
He's a big fan of heavy metal music, particularly AC/ DC.
Yet it's different at home – everything is smaller and there isn't an affinity for heavy metal music like abroad.
LONDON -- It may not destroy your soul, but heavy metal music can be hazardous to your brain.