Plural of clast; multiple fragments or grains of rock broken down by erosion.
From 'clast' (Greek 'klastos', broken) + regular English plural '-s'. Used standardly in geology since the 19th century.
A single river carries millions of clasts downstream—from boulders that tumble to sand that drifts—and the size and shape of clasts tells geologists the river's power and personality.
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