The plural of chert; multiple pieces or deposits of the hard, fine-grained siliceous rock.
Standard English plural formation of 'chert' by adding '-s'. The base word's etymology remains disputed, but the pluralization follows regular modern English convention.
Archaeological sites rich in 'cherts' are treasure troves for scientists—by studying which cherts ancient people used and where they sourced them, researchers can map ancient trade routes thousands of years old.
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